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 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); a pressing rod (33); the rotating block (34) can be connected to the side part of the pressing rod (33) in a one-way rotating manner; the elastic piece (35) acts between the limiting cylinder (32) and the pressing rod (33); the pressing rod (33) can drive the rotating block (34) to move under the action of external force, so that the rotating block (34) rotates in the process of making contact with an ejector block on the fixed seat (31). 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] A fixed seat is fixed relative to the volute, and is provided with a mounting hole and a receiving cavity intersecting the mounting hole. The impeller is sleeved on the outer periphery of the fixed seat through a bearing;

[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 pressing rod is installed in the limiting cylinder, and the lower part can be inserted into the installation hole;

[0011] a rotating block connected to the side of the pressing rod so as to be unidirectionally rotatable; and

[0012] An elastic member acts between the limiting cylinder and the pressing rod so that the limiting cylinder always has a tendency to press downward;

[0013] The accommodating cavity is provided with a top block for pushing the rotating block to rotate and limiting the rotation angle of the rotating block, and the pressing rod can drive the rotating block to move along the axial direction of the mounting hole under the action of external force, so that the rotating block rotates in the process of contacting the top block;

[0014] In the locked state, the rotating block is limited by the top block, and the inner ring of the bearing is limited between the limiting flange and the volute;

[0015] In the unlocked state, the rotating block is separated from the limit of the top block, and the limit flange releases the limit on the inner ring of the bearing.

[0016] In order to facilitate the rotating block to enter and exit the accommodating cavity or be limited in the accommodating cavity, the accommodating cavity includes an inlet portion, a throat portion and an abdominal cavity portion arranged in sequence from top to bottom, and the number of the top blocks is two, which are respectively recorded as a first top block and a second top block. The first top block is located at the bottom of the abdominal cavity, and the second top block is located at the top of the abdominal cavity and deviates from the throat.

[0017] The rotating block is in the shape of an elongated strip. In the unlocked state, the rotating block is arranged along the axial direction of the pressing rod and can enter and exit the abdominal cavity through the throat.

[0018] In order to facilitate the top block to push the rotating block to rotate and limit the rotation angle of the rotating block, the end of the top block has a vertex angle, and the vertex angle side of the vertex angle along the rear side of the rotation direction of the rotating block is recorded as a limiting surface;

[0019] When the top corner of the top block contacts the rotating block, the rotating block can rotate under the push of the top corner;

[0020] When the limiting surface of the top block contacts the rotating block, the rotating block stops rotating;

[0021] In the locked state, the rotating block is deviated from the axial arrangement of the pressing rod and contacts the limiting surface of the second top block.

[0022] In order to increase the rotation angle of the rotating block after each contact with the top block, grooves are provided at both ends of the rotating block, and the two grooves are centrally symmetrically arranged along the rotation direction of the rotating block, and the peripheral wall of each groove includes a first inclined surface and a second inclined surface connected at an angle;

[0023] When the top corner of the top block contacts the first inclined surface, the rotating block can rotate under the push of the top corner;

[0024] In the locked state, the second inclined surface contacts the limiting surface of the second top block.

[0025] In order to facilitate the rotating block to enter the accommodating cavity, the diameter of the inlet portion gradually decreases from top to bottom.

[0026] In order to realize the one-way rotation connection of the rotating block on the pressing rod, a rotating shaft is provided on the side of the pressing rod, a pawl is provided on the periphery of the rotating shaft, an axial hole for the rotating shaft to pass through is opened on the rotating block, a ratchet is provided on the periphery of the axial hole, and the ratchet is arranged around the outer periphery of the ratchet and cooperates with the ratchet for one-way rotation.

[0027] In order to make the rotating block always close to the pressing rod and ensure that the rotating block can rotate only under the action of external force, the end of the rotating shaft has a convex edge, and a corrugated washer is sandwiched between the convex edge and the rotating block.

[0028] 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 elastic member is a compression spring, which is sleeved on the outer circumference of the pressing rod, and both ends of the compression spring are respectively abutted against the first limiting boss and the second limiting boss.

[0029] In order to prevent the pressing rod from being separated from the limiting cylinder, the limiting cylinder, the pressing rod and the 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.

[0030] In order to reduce the occupied space of the accommodating cavity, the rotation axis of the rotating block is perpendicular to the axis of the pressing rod.

[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 pressing rod, a rotating block and an elastic member, and the impeller is installed in the volute through the locking assembly; the rotating block can contact the top block in the fixed seat and rotate as the pressing rod moves, and is limited or released by the top block to achieve locking or unlocking. 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 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 4 A three-dimensional exploded schematic diagram of the middle pressing rod and the rotating block;

[0040] Figure 6 for Figure 5 A schematic diagram of the three-dimensional structure of the middle rotating block and the pawl after being combined;

[0041] Figure 7 for Figure 4 A longitudinal sectional view of the middle fixing seat;

[0042] Figure 8 for Figure 3 Longitudinal cross-sectional view of the middle locking assembly when the rotating block just enters the throat (the locking assembly is in the unlocked state)

[0043] Fig. 9 for Figure 8 A longitudinal cross-sectional view of the rotating block when the first top block is limited after the pressing rod is pressed;

[0044] Fig.10 for Fig. 9 A longitudinal sectional view of the rotating block when the second top block is limited after the pressing rod is released (the locking assembly is in a locked state);

[0045] Fig.11 for Fig.10A longitudinal sectional view when the rotating block contacts the first top block after the pressing rod is pressed;

[0046] Fig.12 for Fig.11 A longitudinal cross-sectional view of the rotating block when the first top block is limited after the pressing rod is continuously pressed;

[0047] Fig.13 for Fig.12 A longitudinal sectional view of the rotating block when the pressing rod is released and the rotating block contacts the second top block;

[0048] Fig.14 for Fig.13 A longitudinal sectional view of the rotating block after it moves to the unlocked state. DETAILED DESCRIPTION

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0050] 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.

[0051] like Figures 1 to 14 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 .

[0052] The impeller 2 is installed in the volute 1 through a locking assembly 3 .

[0053] The locking assembly 3 includes a fixing seat 31 , a limiting cylinder 32 , a pressing rod 33 , a rotating block 34 and an elastic member 35 .

[0054] 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 and a receiving cavity 312 intersecting the mounting hole 311, the bottom end of the mounting hole 311 is closed, and the cross section is semicircular. The impeller 2 is sleeved on the outer periphery of the fixing seat 31 through the bearing 21.

[0055] 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.

[0056] The pressing rod 33 is installed in the limiting cylinder 32, and has a semicircular cross section, and its lower part can be inserted into the mounting hole 311. A rotating shaft 331 is convexly provided on the plane of the side of the pressing rod 33, and the end of the rotating shaft 331 has a convex edge 3311, and a ratchet 332 is provided on the periphery of the rotating shaft 331, and the axis of the rotating shaft 331 is perpendicular to the axis of the pressing rod 33; a second limiting boss 334 is convexly provided on the outer peripheral wall of the top of the pressing rod 33.

[0057] The rotating block 34 is in the shape of an elongated strip, and a shaft hole 342 is provided in the middle for the rotating shaft 331 to pass through. A ratchet 343 is provided around the circumference of the shaft hole 342. The ratchet 343 is arranged around the outer circumference of the above-mentioned pawl 332 and cooperates with the pawl 332 to rotate in one direction, thereby limiting the rotating block 34 to only be able to rotate in one direction. In this embodiment, the rotating block 34 can only rotate in the counterclockwise direction. In addition, a wave washer 333 is sandwiched between the convex edge 3311 of the rotating shaft 331 and the rotating block 34, so that the rotating block 34 is always close to the pressing rod 33, ensuring that the rotating block 34 can only rotate under the action of external force.

[0058] The elastic member 35 is a compression spring, which is sleeved on the outer circumference of the pressing rod 33, and the two ends of the compression spring are respectively abutted on the first limiting boss 322 and the second limiting boss 334, 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 334, so as to prevent the pressing rod 33 from being separated from the limiting cylinder 32, so that the limiting cylinder 32, the pressing rod 33 and the elastic member 35 constitute an integral component.

[0059] In addition, the accommodating cavity 312 includes an inlet portion 3121, a throat portion 3122 and an abdominal cavity portion 3123 which are arranged in sequence from top to bottom. The diameter of the inlet portion 3121 gradually decreases from top to bottom. The width of the throat portion 3122 is slightly larger than the width of the rotating block 34. The abdominal cavity portion 3123 can accommodate the rotating block 34 to rotate therein. The abdominal cavity portion 3123 is provided with a first top block 313 and a second top block 314 for promoting the rotation of the rotating block 34 and limiting the rotation angle of the rotating block 34. The first top block 313 is located at the abdominal cavity portion 3123. The bottom of the cavity 3123 is directly opposite to the throat 3122, and the second top block 314 is located at the top of the abdominal cavity 3123 and deviates from the throat 3122. The end of the top block has a vertex angle, and the vertex angle side of the vertex angle behind the rotation direction of the rotating block 34 is recorded as a limiting surface; grooves 341 are provided at both ends of the rotating block 34, and the two grooves 341 are arranged in a central symmetric manner along the rotation direction of the rotating block 34. The peripheral wall of each groove 341 includes a first inclined surface 3411 and a second inclined surface 3412 connected at an angle. In this embodiment, the vertex angle of the first top block 313 is an acute angle, the vertex angle of the second top block 314 is a right angle, and the limiting surface of the second top block 314 is parallel to the axis of the pressing rod 33; the groove 341 is a right-angle groove, that is, the first inclined surface 3411 and the second inclined surface 3412 are perpendicular to each other.

[0060] The pressing rod 33 can drive the rotating block 34 to move axially along the mounting hole 311 under the action of external force, so that the rotating block 34 rotates in the process of contacting the top block. Specifically, when the top corner of the top block contacts the side surface or the first inclined surface 3411 of the rotating block 34, the rotating block 34 can rotate under the push of the top corner. When the limiting surface of the top block contacts the side surface or the second inclined surface 3412 of the rotating block 34, the rotating block 34 stops rotating.

[0061] In the locked state, the rotating block 34 is arranged away from the axial direction of the pressing rod 33, and the second inclined surface 3412 is contacted with the limiting surface of the second top block 314 and is limited, and the inner ring of the bearing 21 is limited between the limiting flange 321 and the volute 1;

[0062] In the unlocked state, the rotating block 34 is arranged axially along the pressing rod 33 and disengages from the limiting function of the second top block 314, so that it can enter and exit the abdominal cavity 3123 through the throat 3122. In this way, the limiting cylinder 32 can be removed axially from the fixed seat 31 to allow the limiting flange 321 to release the limiting function on the inner ring of the bearing 21.

[0063] 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 to clean the motor.

[0064] The working principle of this embodiment is as follows:

[0065] (1) When installation is required, the impeller 2 is first mounted on the outer periphery of the fixed seat 31 through the bearing 21, and then the limiting cylinder 32, the pressing rod 33, the rotating block 34 and the elastic member 35 are assembled. Then, the lower part of the pressing rod 33 is inserted into the mounting hole 311, and the rotating block 34 is corrected to be arranged along the axial direction of the pressing rod 33 after passing through the throat 3122 (such as Figure 8 As shown in FIG. 1 ), the pressing rod 33 is then pressed inward to drive the rotating block 34 to move downward. When the top corner of the first top block 313 contacts the first inclined surface 3411 of the rotating block 34, the rotating block 34 is pushed to rotate counterclockwise until the limiting surface of the first top block 313 contacts the second inclined surface 3412 of the rotating block 34, and the rotating block 34 stops rotating (as shown in FIG. 1 ). Fig. 9 As shown in the figure, this is the lower limit position of pressing downward), and then the pressing rod 33 is released. The pressing rod 33 extends outward under the elastic force of the elastic member 35 and drives the rotating block 34 to move upward. When the top angle of the second top block 314 contacts the first inclined surface 3411 of the rotating block 34, the rotating block 34 is pushed to rotate in the counterclockwise direction until the limiting surface of the second top block 314 contacts the second inclined surface 3412 of the rotating block 34. The rotating block 34 stops rotating and deviates from the axial arrangement of the pressing rod 33, and cannot be locked by the throat 3122 out of the abdominal cavity 3123 (as shown in the figure). Figure 3 and Fig.10 As shown), 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;

[0066] (2) When disassembly is required, the pressing rod 33 is pressed inward to drive the rotating block 34 to move downward. When the top corner of the first top block 313 contacts the side of the rotating block 34 (such as Fig.11 As shown), the rotating block 34 will be pushed to rotate in the counterclockwise direction until the limiting surface of the first top block 313 contacts the side of the rotating block 34, and the rotating block 34 stops rotating (as shown). Fig.12 As shown in FIG. 1 , which is the lower limit position of the downward pressing), the pressing rod 33 is then released, and the pressing rod 33 extends outward under the elastic force of the elastic member 35 and drives the rotating block 34 to move upward. When the top corner of the second top block 314 contacts the side of the rotating block 34 (as shown in FIG. 1 ), the second top block 314 is pressed downward and the rotating block 34 is pressed downward. Fig.13As shown), the rotating block 34 will be pushed to rotate in the counterclockwise direction until the rotating block 34 is corrected to be arranged along the axial direction of the pressing rod 33, so that the throat 3122 can enter and exit the abdominal cavity 3123 to achieve unlocking (as shown in FIG. Fig.14 As shown), at this time, the limiting cylinder 32 can be taken out from the fixing seat 31 along the axial direction (as shown in FIG. Figure 7 As shown), the limiting flange 321 releases the limiting of the inner ring of the bearing 21, so that 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 A fixed seat (31) is fixed relative to the volute (1), and is provided with a mounting hole (311) and a receiving cavity (312) intersecting the mounting hole (311); the impeller (2) is sleeved on the outer periphery of the fixed 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 pressing rod (33) is installed in the limiting cylinder (32), and the lower part of the pressing rod can be inserted into the installation hole (311); a rotating block (34) connected to the side of the pressing rod (33) in a unidirectionally rotatable manner; and An elastic member (35) acts between the limiting cylinder (32) and the pressing rod (33) so that the limiting cylinder (32) always has a downward pressing tendency; A top block is provided in the accommodating cavity (312) for pushing the rotating block (34) to rotate and limiting the rotation angle of the rotating block (34); the pressing rod (33) can drive the rotating block (34) to move axially along the mounting hole (311) under the action of an external force, so that the rotating block (34) rotates in the process of contacting the top block; In a locked state, the rotating block (34) is limited by the top block, and the inner ring of the bearing (21) is limited between the limiting flange (321) and the volute (1); In the unlocked state, the rotating block (34) is separated from the limit of the top block, and the limit flange (321) releases the limit on the inner ring of the bearing (21).

2. The impeller mounting structure according to claim 1, characterized in that: The accommodating cavity (312) comprises an inlet portion (3121), a throat portion (3122) and an abdominal cavity portion (3123) arranged in sequence from top to bottom. The number of the top blocks is two, which are respectively recorded as a first top block (313) and a second top block (314). The first top block (313) is located at the bottom of the abdominal cavity portion (3123), and the second top block (314) is located at the top of the abdominal cavity portion (3123) and deviates from the bottom of the throat portion (3122). The rotating block (34) is in the shape of an elongated strip. In the unlocked state, the rotating block (34) is arranged along the axial direction of the pressing rod (33) and can enter and exit the abdominal cavity (3123) through the throat (3122).

3. The impeller mounting structure according to claim 2, characterized in that: The end of the top block has a top angle, and the top angle side of the top angle on the rear side along the rotation direction of the rotating block (34) is recorded as a limiting surface; When the top corner of the top block contacts the rotating block (34), the rotating block (34) can rotate under the push of the top corner; When the limiting surface of the top block contacts the rotating block (34), the rotating block (34) stops rotating; In the locked state, the rotating block (34) is arranged away from the axial direction of the pressing rod (33) and is in contact with the limiting surface of the second top block (314).

4. The impeller mounting structure according to claim 3, characterized in that: Grooves (341) are provided at both ends of the rotating block (34), the two grooves (341) are centrally symmetrically arranged along the rotating direction of the rotating block (34), and the peripheral wall of each groove (341) comprises a first inclined surface (3411) and a second inclined surface (3412) connected at an angle; When the top corner of the top block contacts the first inclined surface (3411), the rotating block (34) can rotate under the push of the top corner; In the locked state, the second inclined surface (3412) contacts the limiting surface of the second top block (314).

5. The impeller mounting structure according to claim 2, characterized in that: The diameter of the inlet portion (3121) gradually decreases from top to bottom.

6. The impeller mounting structure according to claim 1, characterized in that: A rotating shaft (331) is provided on the side of the pressing rod (33), and a ratchet (332) is provided on the periphery of the rotating shaft (331). An axial hole (342) for the rotating shaft (331) to pass through is opened on the rotating block (34), and a ratchet (343) is provided on the periphery of the axial hole (342). The ratchet (343) is arranged around the outer periphery of the ratchet (332) and cooperates with the ratchet (332) to rotate in one direction.

7. The impeller mounting structure according to claim 6, characterized in that: The end of the rotating shaft (331) has a convex edge (3311), and a corrugated washer (333) is sandwiched between the convex edge (3311) and the rotating block (34).

8. The impeller mounting structure according to claim 1, 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 (334) is convexly provided on the outer peripheral wall at the top of the pressing rod (33). The elastic member (35) is a compression spring, which is sleeved on the outer periphery of the pressing rod (33), and the two ends of the compression spring are respectively abutted against the first limiting boss (322) and the second limiting boss (334).

9. The impeller mounting structure according to claim 8, characterized in that: A retaining ring (323) for limiting the upper limit position of the second limiting boss (334) is installed on the inner peripheral wall of the limiting cylinder (32).

10. The impeller mounting structure according to claim 1, characterized in that: The rotation axis of the rotating block (34) is perpendicular to the axis of the pressing rod (33).

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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