Impeller mounting structure and range hood

Abstract

The utility model discloses an impeller mounting structure, which comprises a volute (1), an impeller (2) and a locking assembly (3), and is characterized in that the locking assembly (3) comprises a fixed seat (31) and a limiting seat (312) which is internally provided with an annular vertical groove (3121), and the impeller (2) is sleeved on the periphery of the fixed seat (31) through a bearing (21); the periphery of the limiting cylinder (32) is provided with a limiting flange (321) for limiting the inner ring of the bearing (21); the rotating block (33) is accommodated in the limiting seat (312), and the periphery of the rotating block (33) is provided with a locking block (331) capable of entering and exiting the space below the limiting seat (312) through the vertical groove (3121); the driving assembly is used for driving the rotating block (33) to rotate; and the second elastic piece (36) acts between the limiting cylinder (32) and the driving assembly. The utility model further discloses a range hood applying the impeller mounting structure.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen equipment, in particular to an impeller mounting structure and a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil smoke, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil smoke under the range hood into the fan, which is then accelerated by the fan and collected by the volute and guided to be discharged outdoors.

[0003] However, after long-term use of the range hood, the impeller on the internal fan will be covered with oil, resulting in reduced exhaust efficiency, increased noise and other problems. Therefore, it is necessary to regularly disassemble and clean the impeller, which is conducive to efficient exhaust, prolongs the service life of the range hood, and saves electricity.

[0004] At present, the impellers of most range hoods are fixed by nuts. For details, please refer to the Chinese patent "Centrifugal Fan" with patent application number 202220245829.8. Therefore, when disassembling the impeller, it is generally necessary to fix the impeller first, and then unscrew the nut to disassemble it. However, since the blades on the impeller are thin, it is easy to cause the blades to deform during disassembly and assembly, affecting the performance of the fan. At the same time, it is difficult to control the strength when disassembling the nut. If the nut is installed too loosely, it may cause the nut to fall off during the use of the range hood, which poses a greater safety risk; if it is too tight, it will make it more difficult to disassemble next time. This greatly increases the difficulty of disassembling the impeller. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide an impeller installation structure which can avoid blade deformation and is simple and fast to install and disassemble, in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a range hood with the above impeller installation structure.

[0007] The utility model solves the above-mentioned first technical problem by adopting the following technical solution: an impeller installation structure, comprising a volute, an impeller and a locking assembly, wherein the impeller is installed in the volute through the locking assembly, and is characterized in that: the locking assembly comprises

[0008] The fixed seat is fixed relative to the volute, and is provided with a mounting hole. A ring-shaped limit seat is provided in the mounting hole. A vertical groove extending from the top end to the bottom end of the limit seat is provided on the inner peripheral wall of the limit seat. The impeller is arranged on the outer periphery of the fixed seat through a bearing sleeve;

[0009] A limiting cylinder extends along the axial direction of the mounting hole, the lower part of which is sleeved on the outer circumference of the fixing seat, and the circumference of which is provided with a limiting flange for limiting the inner ring of the bearing;

[0010] A rotating block is accommodated in the limiting seat, and has a locking block on its periphery that can enter and exit the space below the limiting seat through the vertical slot;

[0011] A driving assembly, used for driving the rotating block to rotate around the axis of the mounting hole; and

[0012] A second elastic member acts between the limiting cylinder and the driving assembly so that the limiting cylinder always has a downward pressing tendency;

[0013] In the locked state, the locking block is located below the limiting seat, and the inner ring of the bearing is located between the limiting flange and the volute;

[0014] In the unlocked state, the locking block is separated from the limit position of the limit seat, and the limit flange releases the limit position on the inner ring of the bearing.

[0015] In order to drive the rotating block to rotate around the axis of the mounting hole, the driving assembly includes

[0016] A pressing rod is installed in the limiting cylinder, and the rotating block is installed at the bottom of the pressing rod; and

[0017] The first elastic member acts between the rotating block and the fixed seat to make the rotating block always have an upward trend.

[0018] In order to make the rotating block rotate in the process of moving up and down with the pressing rod, the lower part of the pressing rod has a transmission seat that can be inserted into the limiting seat, the peripheral part of the transmission seat has a guide block that cooperates with the vertical groove guide, the outer peripheral wall of the bottom of the pressing rod has a convex edge, the rotating block can be rotatably sleeved on the lower part of the pressing rod, and can move between the transmission seat and the convex edge along the axial direction of the pressing rod;

[0019] The bottom end of the limit seat has at least two teeth arranged in sequence along the circumferential direction, the end faces on both sides of the teeth are a vertical surface and a third inclined surface respectively, and the bottom end of the vertical groove is located at the tail of the third inclined surface of the even-numbered teeth;

[0020] The bottom end of the transmission seat has at least two teeth arranged in sequence along the circumferential direction, and the end surface of one side of the tooth is a second inclined surface corresponding to the third inclined surface, and the slope of the second inclined surface is consistent with that of the third inclined surface. When the pressing rod moves down to the limit position, the second inclined surface is connected to the head of the corresponding third inclined surface, and partially overlaps with the third inclined surface to form a continuous inclined surface, so that the locking block can move along the continuous inclined surface to the bottom of the tail of the third inclined surface;

[0021] In the locked state, the locking block is located below the tail of the third inclined surface of the odd-numbered teeth of the limiting seat;

[0022] In the unlocked state, the locking block is located directly below the guide block and can be separated from the limiting seat through the vertical slot.

[0023] In order to ensure that the top of the locking block can be in close contact with the second inclined surface and the third inclined surface and move smoothly along them, the top of the locking block has a first inclined surface, and the slope of the first inclined surface is consistent with the slope of the second inclined surface and the third inclined surface;

[0024] In the locked state, the first inclined surface is in close contact with the tail of the third inclined surface of the odd-numbered teeth of the limiting seat.

[0025] In order to facilitate the user to align the guide block with the vertical slot and insert it, an indicator arrow is provided on the top wall of the pressing rod, and the direction of the indicator arrow is consistent with the direction of the guide block.

[0026] To facilitate the installation of the first elastic member, the bottom end of the mounting hole is closed. The first elastic member is a compression spring accommodated in the mounting hole. Both ends of the compression spring respectively abut against the bottom wall inside the mounting hole and the bottom surface of the rotating block.

[0027] To facilitate the installation of the second elastic member, a first limiting boss is protruding on the inner circumferential wall at the bottom of the limiting cylinder, and a second limiting boss is protruding on the outer circumferential wall at the top of the pressing rod. The second elastic member is a compression spring, which is sleeved on the outer circumference of the pressing rod, and the two ends of the compression spring are respectively abutted against the first limiting boss and the second limiting boss.

[0028] In order to prevent the pressing rod from being separated from the limiting cylinder, the limiting cylinder, the pressing rod and the second elastic member form an integral assembly, and a retaining ring for limiting the upper limit position of the second limiting boss is installed on the inner peripheral wall of the limiting cylinder.

[0029] In order to improve stability, the number of the vertical grooves is at least two, and they are arranged at intervals along the circumference of the limiting seat, and the locking blocks correspond to the vertical grooves one by one.

[0030] In order to facilitate the installation of the limiting seat in the mounting hole, the inner peripheral wall of the mounting hole is provided with an internal thread, and the outer peripheral wall of the limiting seat is provided with an external thread, and the external thread is threadedly connected to the internal thread of the mounting hole.

[0031] In order to reduce the difficulty of processing, the limiting cylinder is coaxially arranged with the bearing.

[0032] In order to ensure that the motor is not contaminated by oil when the range hood is in use, a motor is also included. The motor is installed on the outside of the volute, and its output shaft is connected to the impeller through a transmission member.

[0033] The technical solution adopted by the utility model to solve the second technical problem is: a range hood with the impeller installation structure.

[0034] Compared with the prior art, the advantages of the utility model are: a locking assembly is composed of a fixed seat, a limiting cylinder, a rotating block, a driving assembly and a second elastic member, and the impeller is installed in the volute through the locking assembly. The locking member on the rotating block can be limited to the bottom of the limiting seat or released to achieve locking or unlocking during the rotation of the rotating block. In this way, the user does not need to fix the impeller when loading and unloading the impeller, which effectively avoids the deformation of the blades in the impeller and does not require the aid of tools. The loading and unloading is simple and fast, which is convenient for users to clean the range hood by themselves. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a three-dimensional structural schematic diagram of the impeller mounting structure in the embodiment of the range hood of the utility model in a locked state;

[0036] Figure 2 for Figure 1 A longitudinal cross-sectional view of

[0037] Figure 3 for Figure 2 The enlarged view of part I;

[0038] Figure 4 for Figure 3 A three-dimensional exploded schematic diagram of the middle locking assembly;

[0039] Figure 5 for Figure 3 A three-dimensional exploded schematic diagram of the middle limit seat, the rotating block and the pressing rod;

[0040] Figure 6 for Figure 3 Schematic diagram of the switching process of the middle limit seat, the rotating block and the pressing rod between the locked state and the unlocked state. DETAILED DESCRIPTION

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0043] like Figures 1 to 6 FIG. 1 is a preferred embodiment of a range hood with an impeller mounting structure according to the utility model. The impeller mounting structure includes a volute 1 , an impeller 2 , a locking assembly 3 and a motor 4 .

[0044] The impeller 2 is installed in the volute 1 through a locking assembly 3 .

[0045] The locking assembly 3 includes a fixing seat 31 , a limiting cylinder 32 , a rotating block 33 , a pressing rod 34 , a first elastic member 35 and a second elastic member 36 .

[0046] Specifically, the bottom of the fixing seat 31 has a fixing portion 310 for fixing on the volute 1; the fixing seat 31 has a mounting hole 311 extending along the axial direction of the impeller 2, the bottom end of the mounting hole 311 is closed, and a ring-shaped limit seat 312 is provided in the mounting hole 311. The impeller 2 is sleeved on the outer periphery of the fixing seat 31 through the bearing 21. In this embodiment, the inner peripheral wall of the mounting hole 311 has an internal thread, and the outer peripheral wall of the limit seat 312 has an external thread, and the external thread is threadedly connected to the internal thread of the mounting hole 311.

[0047] The limiting cylinder 32 extends along the axial direction of the mounting hole 311 and is arranged coaxially with the bearing 21. The lower part of the limiting cylinder 32 is sleeved on the outer periphery of the fixing seat 31. A limiting flange 321 for limiting the inner ring of the bearing 21 is convexly provided on the outer peripheral wall at the bottom of the limiting cylinder 32; a first limiting boss 322 is convexly provided on the inner peripheral wall at the bottom of the limiting cylinder 32.

[0048] The rotating block 33 is accommodated in the limiting seat 312 , and two locking blocks 331 are protruded on the outer peripheral wall and arranged at intervals along the circumference thereof.

[0049] The pressing rod 34 is installed in the limiting cylinder 32. The lower part of the pressing rod 34 has a transmission seat 341 that can be inserted into the limiting seat 312; a convex edge 342 is convexly provided on the outer peripheral wall of the bottom of the pressing rod 34, and a second limiting boss 343 is convexly provided on the outer peripheral wall of the top of the pressing rod 34. The rotating block 33 is rotatably sleeved on the lower part of the pressing rod 34, and can move between the transmission seat 341 and the convex edge 342 along the axial direction of the pressing rod 34.

[0050] The locking block 331 has a first inclined surface 3311 at the top; the inner circumferential wall of the limiting seat 312 is provided with two vertical grooves 3121 arranged at intervals along the circumference thereof and corresponding to the above-mentioned locking blocks 331 one by one, and each vertical groove 3121 extends from the top end of the limiting seat 312 to the bottom end, so that the locking block 331 can pass through the vertical groove 3121 to enter and exit the space below the limiting seat 312; the bottom end of the limiting seat 312 has four teeth arranged in sequence along the circumference, and the end faces on both sides of the teeth are respectively a vertical surface 3122 and a third inclined surface 3123, and the bottom end of the above-mentioned vertical groove 3121 is located at the tail of the third inclined surface 3123 of the even-numbered tooth; the outer circumferential wall of the transmission seat 341 is convexly provided with two guide blocks 3411 arranged at intervals along the circumference thereof and corresponding to the above-mentioned vertical grooves 3121, and each guide block 3411 can be slidably inserted in the corresponding vertical groove 3121, and the corresponding vertical groove 31 21 is guided to cooperate, so that the pressing rod 34 can only move axially along the mounting hole 311, and an indicating arrow 344 is provided on the top wall of the pressing rod 34, and the direction of the indicating arrow 344 is consistent with the direction of the guide block 3411, so that the user can align the guide block 3411 with the vertical groove 3121 for insertion; the bottom end of the transmission seat 341 has a plurality of teeth arranged in sequence along the circumferential direction, and the end face of one side of the tooth is a second inclined surface 3412 corresponding to the third inclined surface 3123; the slopes of the first inclined surface 3311, the second inclined surface 3412 and the third inclined surface 3123 are consistent. When the pressing rod 34 moves down to the extreme position, the second inclined surface 3412 is connected to the head of the corresponding third inclined surface 3123, and overlaps with the third inclined surface 3123 to form a continuous inclined surface, so that the locking block 331 can move along the continuous inclined surface to the bottom of the tail of the third inclined surface 3123.

[0051] The first elastic member 35 is a compression spring, which is accommodated in the mounting hole 311 . Two ends of the compression spring abut against the bottom wall inside the mounting hole 311 and the bottom surface of the rotating block 33 , respectively, so that the rotating block 33 always has an upward trend.

[0052] The second elastic member 36 is a compression spring, which is sleeved on the outer circumference of the pressing rod 34, and the two ends of the compression spring are respectively abutted on the first limiting boss 322 and the second limiting boss 343, so that the limiting cylinder 32 always has a downward pressing tendency. In addition, a retaining ring 323 is installed on the inner peripheral wall of the limiting cylinder 32 to limit the upper limit position of the second limiting boss 343, so as to prevent the pressing rod 34 from being separated from the limiting cylinder 32, so that the limiting cylinder 32, the pressing rod 34 and the second elastic member 36 constitute an integral component.

[0053] The pressing rod 34 can drive the rotating block 33 to move up and down under the action of external force and the cooperation of the first elastic member 35, thereby driving the rotating block 33 to rotate around the axis of the mounting hole 311, so that the locking block 331 can enter and exit the space below the limiting seat 312 through the vertical slot 3121:

[0054] In the locked state, the locking block 331 is limited to the lower part of the tail of the third inclined surface 3123 of the odd-numbered teeth of the limiting seat 312, and the first inclined surface 3311 is closely attached to the tail of the third inclined surface 3123, and the inner ring of the bearing 21 is limited to the lower part between the limiting flange 321 and the volute 1;

[0055] In the unlocked state, the locking block 331 is located directly below the guide block 3411 and can be separated from the limiting seat 312 through the vertical groove 3121. In this way, the limiting cylinder 32 can be removed from the fixing seat 31 along the axial direction to allow the limiting flange 321 to release the limiting of the inner ring of the bearing 21.

[0056] The motor 4 is installed on the outside of the volute 1, and its output shaft is connected to the impeller 2 through a transmission member. In this embodiment, the transmission member is a magnetic component. The specific structure can be found in the Chinese patent application number 202322931221.8 of the applicant's previous application "Blower and Range Hood thereof", which will not be repeated here. In this way, the motor 4 is separated from the impeller 2 to ensure that the motor 4 is not contaminated by oil when the range hood is in use, avoiding the need for motor cleaning.

[0057] The working principle of this embodiment is as follows:

[0058] (1) When installation is required, the impeller 2 is first sleeved on the outer periphery of the fixing seat 31 through the bearing 21, and the first elastic member 35 is placed in the mounting hole 311. Then, the limiting cylinder 32, the rotating block 33, the pressing rod 34 and the second elastic member 36 are assembled, and the locking block 331 is aligned with the guide block 3411 and the vertical groove 3121, and then the lower part of the pressing rod 34 is inserted into the mounting hole 311. During this process, the second inclined surface 3412 of the transmission seat 341 gradually approaches and is closely attached to the first inclined surface 3311 of the locking block 331, thereby pushing the locking block 331 to move down along the vertical groove 3121 and then continue to move down along the vertical surface 3122 connected thereto (such as Figure 6a), and the guide block 3411 moves downward along the vertical slot 3121 until the second inclined surface 3412 of the transmission seat 341 and the third inclined surface 3123 of the limiting seat 312 partially overlap and form a continuous inclined surface (as shown in FIG. Figure 6 b), the locking block 331 is freed from the limit of the vertical surface 3122, and rotates along the second inclined surface 3412 to the lower part of the tail of the second inclined surface 3412 (as shown in FIG. Figure 6 c), and then release the pressing rod 34, the pressing rod 34 rises under the elastic force of the second elastic member 36, and the locking block 331 continues to rotate along the third inclined surface 3123 to the bottom of the tail of the third inclined surface 3123 under the elastic force of the first elastic member 35 to achieve locking (as shown in FIG. Figure 3 and Figure 6 d), at this time, the inner ring of the bearing 21 is clamped between the limiting flange 321 and the volute 1, so that the impeller 2 is installed on the volute 1;

[0059] (2) When disassembly is required, the pressing rod 34 only needs to be pressed inward. During this process, the second inclined surface 3412 of the transmission seat 341 gradually approaches and is in close contact with the first inclined surface 3311 of the locking block 331, thereby pushing the locking block 331 to move down along the vertical groove 3121 and then continue to move down along the vertical surface 3122 connected thereto. At the same time, the guide block 3411 moves down along the vertical groove 3121 until the second inclined surface 3412 of the transmission seat 341 and the third inclined surface 3123 of the limiting seat 312 are aligned. The locking block 331 is separated from the limit of the vertical surface 3122 and rotates along the second inclined surface 3412 to the bottom of the tail of the second inclined surface 3412 under the elastic force of the first elastic member 35. Then, the pressing rod 34 is released and the pressing rod 34 rises under the elastic force of the second elastic member 36. The locking block 331 continues to rotate along the third inclined surface 3123 to the bottom of the tail of the third inclined surface 3123 under the elastic force of the first elastic member 35 (as shown in FIG. Figure 6 a), and then enters the vertical groove 3121 to achieve unlocking. At this time, the limiting cylinder 32 can be taken out from the fixing seat 31 along the axial direction, so that the limiting flange 321 releases the limiting of the inner ring of the bearing 21. In this way, the impeller 2 can be removed from the fixing seat 31, and the disassembly of the impeller 2 is completed.

Claims

1. An impeller mounting structure, comprising a volute (1), an impeller (2) and a locking assembly (3), wherein the impeller (2) is mounted in the volute (1) via the locking assembly (3), and characterized in that: The locking assembly (3) comprises The fixing seat (31) is fixed relative to the volute (1) and is provided with a mounting hole (311). An annular limiting seat (312) is provided in the mounting hole (311). A vertical groove (3121) extending from the top end to the bottom end of the limiting seat (312) is provided on the inner peripheral wall of the limiting seat (312). The impeller (2) is sleeved on the outer periphery of the fixing seat (31) via a bearing (21); A limiting cylinder (32) extends along the axial direction of the mounting hole (311), the lower portion of which is sleeved on the outer circumference of the fixing seat (31), and the circumference of which is provided with a limiting flange (321) for limiting the inner ring of the bearing (21); A rotating block (33) is accommodated in the limiting seat (312), and has a locking block (331) on its periphery that can enter and exit the space below the limiting seat (312) through the vertical groove (3121); A driving assembly, used for driving the rotating block (33) to rotate around the axis of the mounting hole (311); and A second elastic member (36) acts between the limiting cylinder (32) and the driving assembly so that the limiting cylinder (32) always has a downward pressing tendency; In the locked state, the locking block (331) is limited to be located below the limiting seat (312), and the inner ring of the bearing (21) is limited to be located between the limiting flange (321) and the volute (1); In the unlocked state, the locking block (331) is separated from the limiting position of the limiting seat (312), and the limiting flange (321) releases the limiting position on the inner ring of the bearing (21).

2. The impeller mounting structure according to claim 1, characterized in that: The drive assembly includes A pressing rod (34) is installed in the limiting cylinder (32), and the rotating block (33) is installed at the bottom of the pressing rod (34); and The first elastic member (35) acts between the rotating block (33) and the fixed seat (31) so that the rotating block (33) always has an upward trend.

3. The impeller mounting structure according to claim 2, characterized in that: The lower part of the pressing rod (34) has a transmission seat (341) that can be inserted into the limiting seat (312), and the peripheral part of the transmission seat (341) has a guide block (3411) that is matched with the vertical groove (3121). The outer peripheral wall of the bottom of the pressing rod (34) has a convex edge (342), and the rotating block (33) can be rotatably sleeved on the lower part of the pressing rod (34) and can move between the transmission seat (341) and the convex edge (342) along the axial direction of the pressing rod (34); The bottom end of the limit seat (312) has at least two teeth arranged in sequence along the circumferential direction, the end faces on both sides of the teeth are respectively a vertical surface (3122) and a third inclined surface (3123), and the bottom end of the vertical groove (3121) is located at the tail of the third inclined surface (3123) of the even-numbered teeth; The bottom end of the transmission seat (341) has at least two teeth arranged in sequence along the circumferential direction, and the end face of one side of the tooth is a second inclined surface (3412) corresponding to the third inclined surface (3123), and the slope of the second inclined surface (3412) is consistent with that of the third inclined surface (3123). When the pressing rod (34) moves down to the extreme position, the second inclined surface (3412) is connected to the head of the corresponding third inclined surface (3123), and partially overlaps with the third inclined surface (3123) to form a continuous inclined surface, so that the locking block (331) can move along the continuous inclined surface to below the tail of the third inclined surface (3123); In the locked state, the locking block (331) is limited to below the tail of the third inclined surface (3123) of the odd-numbered teeth of the limiting seat (312); In the unlocked state, the locking block (331) is located directly below the guide block (3411) and can be separated from the limiting seat (312) through the vertical groove (3121).

4. The impeller mounting structure according to claim 3, characterized in that: The top of the locking block (331) has a first inclined surface (3311), and the slope of the first inclined surface (3311) is consistent with that of the second inclined surface (3412) and the third inclined surface (3123); In the locked state, the first inclined surface (3311) is in close contact with the tail of the third inclined surface (3123) of the odd-numbered teeth of the limiting seat (312).

5. The impeller mounting structure according to claim 3, characterized in that: An indication arrow (344) is provided on the top wall of the pressing rod (34), and the direction of the indication arrow (344) is consistent with the direction of the guide block (3411).

6. The impeller mounting structure according to claim 2, characterized in that: The bottom end of the mounting hole (311) is closed, and the first elastic member (35) is a compression spring, which is accommodated in the mounting hole (311), and the two ends of the compression spring respectively abut against the bottom wall inside the mounting hole (311) and the bottom surface of the rotating block (33).

7. The impeller mounting structure according to claim 2, characterized in that: A first limiting boss (322) is convexly provided on the inner peripheral wall at the bottom of the limiting cylinder (32), and a second limiting boss (343) is convexly provided on the outer peripheral wall at the top of the pressing rod (34). The second elastic member (36) is a compression spring, which is sleeved on the outer periphery of the pressing rod (34), and the two ends of the compression spring are respectively abutted against the first limiting boss (322) and the second limiting boss (343).

8. The impeller mounting structure according to claim 7, characterized in that: A retaining ring (323) for limiting the upper limit position of the second limiting boss (343) is installed on the inner peripheral wall of the limiting cylinder (32).

9. The impeller mounting structure according to claim 1, characterized in that: The number of the vertical grooves (3121) is at least two, and they are arranged at intervals along the circumference of the limiting seat (312), and the locking blocks (331) correspond to the vertical grooves (3121) one by one.

10. The impeller mounting structure according to claim 1, characterized in that: The inner peripheral wall of the mounting hole (311) is provided with an internal thread, and the outer peripheral wall of the limiting seat (312) is provided with an external thread, and the external thread is threadedly connected to the internal thread of the mounting hole (311).

11. The impeller mounting structure according to claim 1, characterized in that: The limiting cylinder (32) is coaxially arranged with the bearing (21).

12. The impeller mounting structure according to any one of claims 1 to 11, characterized in that: It also includes a motor (4), which is installed on the outside of the volute (1), and its output shaft is connected to the impeller (2) through a transmission member.

13. A range hood using the impeller mounting structure according to any one of claims 1 to 12.

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