Lock nut device for mounting impeller of centrifugal fan, centrifugal fan and range hood

Abstract

The utility model relates to a locknut device for mounting an impeller of a centrifugal fan, the centrifugal fan and a range hood, the locknut device is used for being connected to an output shaft of a motor of the centrifugal fan, and the locknut device comprises a nut assembly, a nut part, a nut seat and a locking assembly, one end part of the torsion spring is exposed out of the outer peripheral wall of the nut piece to serve as an unlocking end part; the knob assembly is connected with the nut seat and can drive the nut seat to rotate in the first direction to achieve locking of the nut seat and rotate in the second direction to achieve unlocking of the nut seat, and the knob assembly can further rotate between a first position and a second position relative to the nut seat; in the process that the rotary knob assembly moves from the first position to the second position, the rotary knob assembly acts on the unlocking end of the torsional spring so as to relieve the tensioning state of the torsional spring. The first direction is opposite to the second direction. The anti-loosening nut has the advantages of being good in anti-loosening effect and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan impeller installation anti-loosening nut device, a centrifugal fan and a range hood. Background Art

[0002] Centrifugal fans are an important air supply device, commonly used in range hoods, air conditioners and other products. Among them, the fan system is the core component of the range hood, and the impeller is the key component of the fan system. When the impeller is contaminated by oil and the surface of the blades is oily, the oil will change the streamline of the blades and increase the weight of the impeller, thus causing the overall performance of the fan system to decline. When the accumulated oil reaches a certain amount, the overall performance of the range hood is seriously reduced, the noise increases, the air volume loss is serious, and smoke leakage occurs, which seriously affects the user experience. Therefore, after the range hood has been used for a period of time, the range hood, especially the impeller of its fan system, needs to be disassembled and cleaned.

[0003] In order to facilitate the disassembly and assembly of the impeller, a Chinese utility model patent application with application number CN01239583.8 discloses a fan impeller installation structure for a range hood, including an impeller and a motor output shaft, the impeller including a front ring and a rear ring arranged relatively to each other and a plurality of blades connected to the outer edges of the two, a wheel disk fixed at the central part of the rear ring, a central hole for the motor output shaft to pass through is opened on the wheel disk, a slot is opened on the central rear end face of the wheel disk, and a pin that can be embedded in the slot is passed through the motor output shaft at a corresponding position, and the front end face of the wheel disk is limited by a hand-tightening nut connected to the front end thread of the motor output shaft. However, the fixing method of the impeller is basically a left-handed tightening nut, and a certain pre-tightening force needs to be applied during installation to prevent loosening. During the long-term use of the fan, due to the vibration problem of the impeller, it is easy to loosen due to insufficient pre-tightening of the hand-tightening nut installation, that is, it does not have an anti-loosening effect, and therefore, there are certain safety hazards. Utility Model Content

[0004] The first technical problem to be solved by the utility model is to provide a centrifugal fan impeller installation anti-loosening nut device which has good anti-loosening effect and is convenient for disassembly and assembly in view of the current status of the prior art.

[0005] The second technical problem to be solved by the utility model is to provide a centrifugal fan using the above impeller installation structure in view of the current status of the prior art.

[0006] The third technical problem to be solved by the present invention is to provide a range hood using the centrifugal fan according to the current status of the prior art.

[0007] The technical solution adopted by the utility model to solve the first technical problem is: The technical solution adopted by the utility model to solve the above technical problem is: a centrifugal fan impeller installation anti-loosening nut device, used to be connected to the output shaft of the motor of the centrifugal fan, comprising:

[0008] The nut assembly comprises a nut member having a torsion spring embedded therein and a nut seat on which the nut member is mounted, wherein one end of the torsion spring is exposed outside the outer peripheral wall of the nut member and serves as an unlocking end;

[0009] a knob assembly connected to the nut seat, and capable of driving the nut seat to rotate in a first direction to achieve locking of the nut seat and to rotate in a second direction to achieve unlocking of the nut seat, and the knob assembly can also rotate relative to the nut seat between a first position and a second position, and in the process of the knob assembly moving from the first position to the second position, the knob assembly acts on the unlocking end of the torsion spring to release the tension state of the torsion spring;

[0010] The first direction is opposite to the second direction.

[0011] In order to achieve the purpose of unlocking the knob assembly during the rotation process relative to the nut seat, the knob assembly includes a knob member and a toggle member that can move with the knob member, the knob member defines a accommodating chamber with an opening at the front, the toggle member and the nut assembly are both arranged in the accommodating chamber, and the toggle member is located on the side of the nut assembly away from the front opening of the accommodating chamber, and the main body of the toggle member has a toggle rod extending toward the position of the unlocking end of the torsion spring to drive the unlocking end of the torsion spring to move during the rotation of the knob member.

[0012] In order to achieve the conversion and matching between the nut seat and the knob assembly, the nut seat has an installation chamber open at the front, the nut member is arranged in the installation chamber, and the rear side wall of the nut seat is provided with a clearance opening which is connected with the installation chamber and extends along the circumferential direction. The lever of the toggle member passes through the clearance opening and extends into the installation chamber.

[0013] In order to ensure that the toggle member can rotate smoothly during the rotation of the knob, the rear side wall of the nut seat is partially recessed forward to form an accommodating recess, and the main body of the toggle member can be rotatably constrained in the accommodating recess, and the clearance opening is located on the bottom wall of the accommodating recess.

[0014] In order to ensure the overall reliability of the anti-loosening nut device, the middle part of the rear side wall of the nut seat is connected to the bottom wall of the accommodating chamber of the knob member through an axially extending connecting column assembly, and the connecting column assembly connected between the nut seat and the knob member is configured to limit the axial movement of the nut seat and the knob member, while allowing the two to rotate relative to each other in the circumferential direction.

[0015] In order to simplify the installation structure between the knob member and the nut seat, the middle part of the bottom wall of the accommodating chamber of the knob member has a first connecting column extending forward and abutting against the rear side wall of the nut seat, a through hole is opened on the rear side wall of the nut seat at a position opposite to the first connecting column, and the rear side wall of the nut seat is connected to the end of the first connecting column through a second connecting column inserted in the through hole;

[0016] The first connecting column and the second connecting column together constitute the connecting column assembly.

[0017] In order to drive the toggle member to rotate, the first connecting column has a non-circular cross-section, and the main body of the toggle member is provided with a connecting hole adapted to the first connecting column. The main body of the toggle member is sleeved on the first connecting column through the connecting hole and can rotate with the knob member.

[0018] In order to realize the relative rotation between the knob member and the nut seat, the inner circumferential wall of the accommodating chamber of the knob member is provided with an inwardly protruding protrusion on the edge adjacent to its front opening, and the outer circumferential wall of the nut seat is provided with a sliding groove extending along its circumference and an installation opening for the protrusion to slide axially into the sliding groove in the area corresponding to the protrusion of the knob member.

[0019] In order to make the nut assembly (driven by the knob member) be more evenly stressed, the knob member has two symmetrically arranged protrusions, and the nut seat also has two corresponding sliding grooves and mounting openings.

[0020] In order to ensure the matching installation between the nut seat and the knob member, the front part of the outer peripheral wall of the nut seat body has a first step and a second step whose outer diameters increase successively from back to front, and the slide groove and the installation port are both arranged on the first step. The peripheral edge of the front opening of the knob member abuts against the position where the first step and the second step meet, and the outer peripheral wall of the knob member is flush with the outer peripheral wall of the second step of the nut seat.

[0021] In order to facilitate the user to perform the rotation operation and avoid the slipping problem, the outer peripheral wall of the knob member is also provided with anti-slip grooves which are sequentially arranged along the circumference and are all recessed inwards.

[0022] In order to ensure the dynamic balance of the anti-loosening nut device as a whole during the rotation process, the toggle rods on the toggle member have two symmetrically arranged relative to the axis of the nut seat, and the nut seat also has two corresponding clearance openings.

[0023] The technical solution adopted by the utility model to solve the second technical problem is: a centrifugal fan, including a volute, an impeller assembly and a motor, the main body of the motor is connected to the volute, the impeller assembly is arranged in the volute and connected to the output shaft of the motor, and the output shaft of the motor and the impeller assembly are connected by the above-mentioned centrifugal fan impeller installation anti-loosening nut device.

[0024] The technical solution adopted by the utility model to solve the third technical problem is: a range hood, including a fan system, and the fan system adopts the above-mentioned centrifugal fan.

[0025] Compared with the prior art, the utility model has the following advantages: the nut member with a torsion spring embedded inside can be securely locked with the output shaft of the motor; when unlocking, when the user rotates the knob assembly in the opposite direction (along the second direction), the knob assembly can act on the unlocking end of the torsion spring to release the tension of the torsion spring; in this way, when the anti-loosening effect of the torsion spring is released, the knob assembly can continue to be rotated in the second direction, and the anti-loosening nut device can be easily removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the anti-loosening nut device of an embodiment of the utility model;

[0027] Figure 2 An exploded view of the anti-loosening nut device of an embodiment of the utility model;

[0028] Figure 3 An axial cross-sectional view of a locking nut device according to an embodiment of the utility model;

[0029] Figure 4 It is a three-dimensional structural schematic diagram of a knob member of an embodiment of the utility model;

[0030] Figure 5 It is a three-dimensional structural schematic diagram of a nut assembly according to an embodiment of the utility model;

[0031] Figure 6 It is a three-dimensional structural schematic diagram of a nut member according to an embodiment of the utility model. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] 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.

[0034] Figure 1-Figure 6 , shows a preferred embodiment of the utility model, a centrifugal fan impeller mounting anti-loosening nut device is used to be connected to the output shaft of the motor of the centrifugal fan, including a nut assembly and a knob assembly.

[0035] The nut assembly includes a nut member 10 with a torsion spring 11 embedded therein and a nut seat 12 on which the nut member 10 is mounted. The structure of the nut member 10 with a torsion spring 11 embedded therein is prior art and is not described in detail herein. One end of the torsion spring 11 is confined in a positioning groove 100 of the nut member 10, while the other end passes through the wall of the nut member 10 and is exposed outside the outer peripheral wall of the nut member 10, thereby serving as an unlocking end 111. When the unlocking end 111 is driven by an external force, the tension of the torsion spring 11 can be adjusted.

[0036] See also Figure 3 The nut seat 12 has an installation chamber 120 which is open at the front, and the nut member 10 is arranged in the installation chamber 120. The nut member 10 is installed in the nut seat 12. In order to achieve a secure connection between the nut member 10 and the nut seat 12, the nut seat 12 and the nut member 10 can be injection molded and embedded together, and the hexagonal edge of the nut member 10 is used to prevent loose rotation in the circumferential direction.

[0037] The nut seat 12 of this embodiment is a stepped cylindrical structure with a large front portion and a small rear portion. The rear side wall of the nut seat 12 is partially recessed forward to form a receiving recess 122. The receiving recess 122 is circular in shape as a whole, and the main body (also a corresponding circular plate structure) of the toggle member 30 of the knob assembly can be stably rotated and constrained therein. The bottom wall of the receiving recess 122 of the nut seat 12 is provided with a clearance opening 121 that is connected to the installation chamber 120 and is arranged to extend in the circumferential direction.

[0038] The knob assembly includes a knob member 20 and a toggle member 30 that can move with the knob member 20. The knob member 20 defines a receiving chamber 24 that is open at the front. The toggle member 30 and the nut assembly are both arranged in the receiving chamber 24, wherein the main body of the toggle member 30 is located on the side away from the front opening of the receiving chamber 24 relative to the nut assembly, that is, located at the rear side of the nut assembly. The main body of the toggle member 30 is provided with a toggle rod 32 extending forward, and the toggle rod 32 specifically extends to the position of the unlocking end 111 of the torsion spring 11 through the clearance opening 121 on the nut seat 12. When the toggle member 30 can rotate in the opposite direction with the knob member 20, the toggle rod 32 can drive the unlocking end 111 of the torsion spring 11 to move, thereby releasing the tension state of the torsion spring 11.

[0039] In this embodiment, the toggle member 30 has two symmetrically arranged toggle rods 32 , and the nut seat 12 also has two corresponding toggle openings 121 , thereby ensuring the dynamic balance of the anti-loosening nut device during rotation.

[0040] See also Figure 4 The inner peripheral wall of the accommodating chamber 24 of the knob member 20 has a protruding block 21 protruding inwardly on the edge adjacent to the front opening thereof, wherein the protruding blocks 21 are symmetrically arranged. The front portion of the outer peripheral wall of the main body of the nut seat 12 has a first step 126 and a second step 127 whose outer diameters increase sequentially from the back to the front. The peripheral edge of the front opening of the knob member 20 abuts against the position where the first step 126 and the second step 127 meet, and the outer peripheral wall of the knob member 20 is flush with the outer peripheral wall of the second step 127 of the nut seat 12, thereby ensuring the overall aesthetics of the anti-loosening nut device. The first step 126 of the nut seat 12 is provided with a slide groove 124 extending along its circumference in the area corresponding to the protruding block 21 of the knob member 20, and an installation opening 125 for the protruding block 21 to slide into the slide groove 124 from the back to the front, wherein the installation opening 125 is located at the end position of the slide groove 124. Corresponding to the two symmetrically arranged protrusions 21 on the knob member 20 , the nut seat 12 also has two corresponding sliding grooves 124 and mounting openings 125 .

[0041] The middle of the rear side wall of the nut seat 12 is connected to the bottom wall of the accommodating chamber 24 of the knob member 20 through an axially extending connecting column assembly. Specifically, the middle of the bottom wall of the accommodating chamber 24 of the knob member 20 has a first connecting column 22 extending forward, and the cross section of the first connecting column 22 is non-circular. The middle of the main body of the toggle member 30 is provided with a connecting hole 31 adapted to the first connecting column 22, that is, the connecting hole 31 is also non-circular. The main body of the toggle member 30 is sleeved on the first connecting column 22 through the connecting hole 31. In this way, when the knob member 20 rotates forward and backward, the toggle member 30 also rotates together. More specifically, the first connecting column 22 of the knob member 20 passes through the connecting hole 31 of the toggle member 30 and abuts against the rear side wall of the nut seat 12. The rear side wall of the nut seat 12 is connected to the end of the first connecting column 22 through a second connecting column 23 (such as a step screw). Correspondingly, a through hole 123 is provided on the rear side wall of the nut seat 12 at a position opposite to the end of the first connecting column 22. The second connecting column 23 is inserted into the through hole 123 and connected to the end of the first connecting column 22. After the nut seat 12 is connected to the knob member 20 by the second connecting column 23, there is no need to lock it (a gap for free rotation can be appropriately left). The first connecting column 22 and the second connecting column 23 together constitute the above-mentioned connecting column assembly. The knob member 20 and the nut seat 12 connected by the above-mentioned connecting column assembly are restricted in the axial direction and cannot move, but can rotate relative to each other in the circumferential direction.

[0042] In order to avoid slipping during rotation and facilitate the user to apply force, the outer peripheral wall of the knob member 20 may be provided with anti-slip grooves (not shown) which are sequentially arranged along the circumference and all recessed inwards.

[0043] The working process of this embodiment is as follows: when installing, the anti-loosening nut is sleeved on the output shaft of the motor, and the knob member 20 is rotated in the first direction (counterclockwise). Since the protrusion 21 of the knob member 20 acts on the action surface of one side of the slide groove 124 of the nut seat 12, the nut seat 12 and the nut member 10 are driven to rotate counterclockwise, thereby locking the anti-loosening nut on the output shaft of the motor, thereby achieving the purpose of locking the impeller. Since the locking nut is prevented from loosening by the torsion spring 11, the manual pre-tightening force can be locked. When disassembly is required, the knob is rotated in the second direction (clockwise), and the protrusion 21 of the knob member 20 slides in the opposite direction in the slide groove 124, driving the toggle member 30 to rotate clockwise at the same time. The toggle rod 32 of the toggle member 30 drives the unlocking end 111 of the torsion spring 11 to rotate a certain angle. At this time, the protrusion 21 of the knob member 20 also contacts the other side wall of the slide groove 124, driving the nut seat 12 to drive the nut member 10 to unlock clockwise. Since the torsion spring 11 is lifted, the anti-loosening effect is released, and the nut can be removed at this time.

[0044] The present embodiment also relates to a centrifugal fan, comprising a volute, an impeller assembly and a motor, wherein the main body of the motor is connected to the volute, the impeller assembly is disposed in the volute and connected to the output shaft of the motor, and the output shaft of the motor and the impeller assembly are connected using the above-mentioned centrifugal fan impeller mounting anti-loosening nut device.

[0045] The present embodiment also relates to a range hood, comprising a fan system, wherein the fan system adopts the centrifugal fan mentioned above.

Claims

1. A centrifugal fan impeller mounting anti-loosening nut device, used to be connected to the output shaft of the motor of the centrifugal fan, characterized in that: include: A nut assembly comprises a nut member (10) having a torsion spring (11) embedded therein and a nut seat (12) on which the nut member (10) is mounted, wherein one end of the torsion spring (11) is exposed outside the outer peripheral wall of the nut member (10) and serves as an unlocking end (111); a knob assembly connected to the nut seat (12) and capable of driving the nut seat (12) to rotate in a first direction to achieve locking of the nut seat (12) and to rotate in a second direction to achieve unlocking of the nut seat (12); the knob assembly can also rotate relative to the nut seat (12) between a first position and a second position; in the process of the knob assembly moving from the first position to the second position, the knob assembly acts on the unlocking end (111) of the torsion spring (11) to release the tension state of the torsion spring (11); The first direction is opposite to the second direction.

2. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 1, characterized in that: The knob assembly comprises a knob member (20) and a toggle member (30) capable of moving with the knob member (20); the knob member (20) defines a accommodating chamber (24) which is open at the front; the toggle member (30) and the nut assembly are both arranged in the accommodating chamber (24); and the toggle member (30) is located on a side of the nut assembly which is away from the front opening of the accommodating chamber (24); and the main body of the toggle member (30) has a toggle rod (32) which extends toward the position where the unlocking end (111) of the torsion spring (11) is located so as to drive the unlocking end (111) of the torsion spring (11) to move during the rotation of the knob member (20).

3. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 2, characterized in that: The nut seat (12) has an installation chamber (120) which is open at the front, and the nut member (10) is arranged in the installation chamber (120). A clearance opening (121) which is connected to the installation chamber (120) and extends in the circumferential direction is opened on the rear side wall of the nut seat (12), and the lever (32) of the shifting member (30) passes through the clearance opening (121) and extends into the installation chamber (120).

4. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 3, characterized in that: The rear side wall of the nut seat (12) is partially recessed forward to form a receiving recess (122), and the main body of the shifting member (30) can be rotatably constrained in the receiving recess (122), and the clearance opening (121) is located on the bottom wall of the receiving recess (122).

5. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 4, characterized in that: The middle portion of the rear side wall of the nut seat (12) is connected to the bottom wall of the accommodating chamber (24) of the knob member (20) via an axially extending connecting column assembly, and the connecting column assembly connected between the nut seat (12) and the knob member (20) is configured to restrict the nut seat (12) and the knob member (20) from moving in the axial direction while allowing the two to rotate relative to each other in the circumferential direction.

6. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 5, characterized in that: The middle part of the bottom wall of the accommodating chamber (24) of the knob member (20) has a first connecting column (22) extending forward and abutting against the rear side wall of the nut seat (12); a through hole (123) is provided on the rear side wall of the nut seat (12) at a position opposite to the first connecting column (22); the rear side wall of the nut seat (12) is connected to the end of the first connecting column (22) via a second connecting column (23) penetrating through the through hole (123); The first connecting column (22) and the second connecting column (23) together constitute the connecting column assembly.

7. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 6, characterized in that: The first connecting column (22) has a non-circular cross-section, and a connecting hole (31) adapted to the first connecting column (22) is provided on the main body of the toggle member (30). The main body of the toggle member (30) is sleeved on the first connecting column (22) through the connecting hole (31) and can rotate with the knob member (20).

8. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 2, characterized in that: The inner peripheral wall of the accommodating chamber (24) of the knob member (20) is provided with a protrusion (21) protruding inwardly on the edge adjacent to the front opening thereof, and the outer peripheral wall of the nut seat (12) is provided with a slide groove (124) extending along its circumference and a mounting opening (125) for the protrusion (21) to slide axially into the slide groove (124) in an area corresponding to the protrusion (21) of the knob member (20).

9. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 8, characterized in that: The knob member (20) has two symmetrically arranged protrusions (21), and the nut seat (12) also has two corresponding sliding grooves (124) and mounting openings (125).

10. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 8, characterized in that: The front portion of the outer peripheral wall of the main body of the nut seat (12) has a first step (126) and a second step (127) whose outer diameters increase successively from the back to the front, and the slide groove (124) and the mounting opening (125) are both arranged on the first step (126). The peripheral edge of the front opening of the knob member (20) abuts against the position where the first step (126) and the second step (127) meet, and the outer peripheral wall of the knob member (20) is flush with the outer peripheral wall of the second step (127) of the nut seat (12).

11. The anti-loosening nut device for installing a centrifugal fan impeller according to claim 2, characterized in that: The outer peripheral wall of the knob (20) is also provided with anti-slip grooves which are sequentially arranged along its circumference and are all recessed inwards.

12. The anti-loosening nut device for installing the centrifugal fan impeller according to claim 3, characterized in that: The shifting rods (32) on the shifting member (30) are provided with two symmetrically arranged relative to the axis of the nut seat (12), and the nut seat (12) is provided with two corresponding clearance openings (121).

13. A centrifugal fan, comprising a volute, an impeller assembly and a motor, wherein the main body of the motor is connected to the volute, the impeller assembly is arranged in the volute and connected to the output shaft of the motor, characterized in that: The output shaft of the motor is connected to the impeller assembly by using a centrifugal fan impeller mounting anti-loosening nut device as described in any one of claims 1 to 12.

14. A range hood, comprising a fan system, characterized in that: The fan system adopts the centrifugal fan as claimed in claim 13.

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