CN218864259U - Filter screen mounting structure and range hood with same - Google Patents

Abstract

The utility model discloses a filter screen mounting structure and a range hood applying the same, wherein the filter screen mounting structure comprises a rotary screen disc component and a driving mechanism, the rotary screen disc component comprises a screen disc main body, the driving mechanism is a motor for driving the screen disc main body to rotate, the motor comprises a motor shaft passing through the screen disc main body, and a radial inward concave groove is formed on the peripheral wall of the motor shaft; the rotary net plate assembly further comprises a fastening self-locking assembly rotating synchronously with the net plate main body, the fastening self-locking assembly comprises a shell and a locking ejector block arranged in the shell and rotating synchronously with the shell, the motor shaft penetrates into the shell, the locking ejector block can move along the radial direction of the motor shaft and keep the trend of being ejected into the groove, and therefore the fastening self-locking assembly and the motor shaft are enabled to achieve axial and circumferential positioning and then rotate synchronously.

Description

Filter screen mounting structure and range hood with same

Technical Field

The utility model relates to a filter equipment, especially a filter screen mounting structure to and applied range hood that has this mounting structure

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

Although various range hoods with self-cleaning function are available in the market, the range hoods are all dirty and then cleaned, the effect of treating the symptoms is not the primary cause, and the problem can be better solved by blocking the oil stains through the rotary screen plate shielding. Among the prior art, although can realize the fastening of rotatory net dish, but because the filter screen belongs to the part that easily dirties, need often dismantle and maintain, if adopt bolted connection, need use the spanner when needing the user to clean to still will grasp rotatory net dish (prevent that the motor shaft is rotatory) and just can pull down the filter screen clean and maintain, because the grease is more on the filter screen, not only make dirty operating personnel easily, but also it is more time-consuming and laboursome still, user experience is poor.

Therefore, a quick-release rotary net disc is also provided, for example, a dynamic net disc of an oil fume purifier disclosed in the Chinese patent with the application number of 202120852821.3, comprises a supporting seat, a connecting disc is fixedly sleeved on the side wall of the supporting seat, and upper spokes are connected at the edge of the connecting disc at equal angles; the outer wall of the connecting ring is provided with the end part of the upper spoke, and an upper spoke which plays a role in collecting oil drops is connected between the connecting ring and the outer sleeve; and the butt joint block is fixedly installed at the port of the supporting seat, the lower end of the butt joint block is inserted into the end part of the motor shaft, and the outer wall of the motor shaft is attached to the inner wall of the supporting seat.

However, in the quick release structure, the front end of the motor shaft is made hollow for arranging the spring and the fixed block, so that the strength of the motor shaft is reduced; in addition, the control rod needs to be pulled transversely by hand during operation, but the control rod has a small operation area, so that the operation is inconvenient (the control rod is not easy to see and operate under the condition that the range hood shell is shielded), and the transverse movement in the installation state is easy to clamp and is not easy to align, so that the improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is not enough to above-mentioned prior art existence, provides a filter screen mounting structure, ensures actuating mechanism's intensity, and fixes a position when being convenient for operate and install.

The utility model aims to solve the second technical problem that a range hood that uses there is above-mentioned filter screen mounting structure is provided.

The utility model provides a first technical scheme that above-mentioned technical problem adopted does: the utility model provides a filter screen mounting structure, includes rotatory net dish subassembly and actuating mechanism, rotatory net dish subassembly includes the net dish main part, actuating mechanism is for being used for driving the rotatory motor of net dish main part, the motor is including the motor shaft that passes the net dish main part, its characterized in that:

a groove which is inwards sunken in the radial direction is formed on the peripheral wall of the motor shaft;

the rotary net plate assembly further comprises a fastening self-locking assembly synchronously rotating with the net plate main body, the fastening self-locking assembly comprises a shell and a locking ejector block arranged in the shell and synchronously rotating with the shell, a motor shaft penetrates into the shell, the locking ejector block can move in the radial direction of the motor shaft and keep the trend of being ejected into a groove, and therefore the fastening self-locking assembly and the motor shaft can be axially and circumferentially positioned and then synchronously rotate.

Through forming the recess on the perisporium of motor shaft, the locking kicking block is in the outside of motor shaft and recess cooperation to ensure the intensity of motor shaft when realizing axial and circumference location.

Furthermore, in order to facilitate the movement of the locking ejector block, the fastening self-locking assembly further comprises a pull ring capable of moving along the direction parallel to the axial direction of the motor shaft, a first sliding block and a second sliding block capable of moving synchronously with the pull ring, wherein the pull ring partially extends into the shell from one side of the shell, which is far away from the net disk main body, the second sliding block is arranged in the shell, at least part of the first sliding block is matched with the inclined surface of the second sliding block so that the axial movement of the first sliding block can be converted into the radial movement of the second sliding block along the motor shaft, the locking ejector block and the second sliding block move synchronously, and when the first sliding block moves towards the direction far away from the net disk main body, the second sliding block and the locking ejector block are pushed to move towards the direction far away from the motor shaft.

In order to facilitate connection of the first sliding block and the pull ring and resetting of the first sliding block, the fastening self-locking assembly further comprises a base arranged in the shell, the pull ring is fixed with the base, the first sliding block is arranged on the base, and a first elastic piece is arranged between one side of the base and one side of the shell far away from the net disk main body, so that the base keeps the trend of moving towards the direction of the net disk main body.

In order to limit the motion path of the second slide block and the locking top block and simultaneously enable the second slide block and the locking top block to synchronously rotate with the shell, the shell further comprises a guide post extending along the radial direction of the motor shaft, the guide post penetrates through the first slide block and the second slide block, the first slide block can move relative to the guide post along the direction parallel to the axial direction of the motor shaft, the second slide block is limited by the guide post to move along the radial direction of the motor shaft, the second slide block is arranged between the first slide block and the side wall of the shell, and the locking top block is arranged on one side, away from the second slide block, of the first slide block.

In order to apply force to the second sliding block to enable the locking ejector block to be pushed into the groove, a second elastic piece enabling the locking ejector block to keep the trend of being pushed into the groove is arranged on the guide post, and the second elastic piece abuts between the second sliding block and the side wall of the shell.

In order to ensure that the first sliding block and the guide groove move relatively in the direction parallel to the axial direction of the motor shaft, the first sliding block is provided with the guide groove extending in the direction parallel to the axial direction of the motor shaft, and the guide post penetrates through the guide groove, so that the first sliding block can move relative to the guide post in the direction parallel to the axial direction of the motor shaft.

In order to facilitate the shell to position the motor shaft in the installation process, the shell comprises a shell body and a first sleeve arranged in the shell body, the motor shaft is inserted into the first sleeve, and the locking ejector block penetrates through the first sleeve to be matched with the groove of the motor shaft.

In order to guide the relative movement between the base and the shell, the fastening self-locking assembly further comprises a base arranged in the shell, the first sleeve penetrates through the base, a second sleeve which is shorter than the first sleeve is arranged on the base, and the second sleeve is sleeved outside the first sleeve.

For making motor shaft and locking kicking block atress even to it is steady when the motor shaft drives rotatory net dish subassembly and rotates, the locking kicking block has two and relative motor shaft symmetrical arrangement, and the recess on the corresponding motor shaft also has two of symmetry setting.

In order to facilitate circumferential positioning of the net disc main body and the fastening self-locking assembly during installation, the net disc main body comprises a net disc, a rotating disc and a fastening connecting disc, the net disc is located between the rotating disc and the fastening connecting disc, the motor shaft penetrates through the rotating disc and the fastening connecting disc, the fastening connecting disc and the net disc are tightly jacked by the shell, a pit is formed in one surface, facing the shell, of the fastening connecting disc, the fastening self-locking assembly further comprises a jacking column which synchronously moves with the pull ring, and the jacking column extends out of the shell from the inside of the shell and can be jacked into the pit, so that the fastening self-locking assembly and the fastening connecting disc are circumferentially positioned.

In order to facilitate the positioning of the motor shaft during installation, a protruding block is arranged on the motor shaft, a first through hole and a second through hole are formed in the middle of the fastening connecting disc, the first through hole is in a circular shape matched with the motor shaft, the second through hole is formed in the periphery of the first through hole and communicated with the first through hole, and the protruding block penetrates into the second through hole, so that the motor shaft and the fastening connecting disc are circumferentially positioned.

In order to further ensure that the motor shaft drives the net disc main body to rotate, the motor shaft is further provided with a positioning pin, a positioning groove matched with the positioning pin is formed in the rotating disc, the positioning pin is inserted into the positioning groove, so that the motor shaft and the rotating disc synchronously rotate, and the net disc, the rotating disc and the fastening connecting disc are pressed tightly by the positioning pin and the shell.

The utility model provides a second technical scheme that above-mentioned technical problem adopted does: a range hood, its characterized in that: a screen mounting structure as described above is applied.

Preferably, range hood is the top suction type, range hood includes collection petticoat pipe, sets up the fan frame on collection petticoat pipe and sets up the fan system in the fan frame, set up the air intake on the collection petticoat pipe, rotatory net disk subassembly is installed in air intake department.

Compared with the prior art, the utility model has the advantages of: the locking ejector block is matched with the groove on the outer part of the motor shaft by forming the groove on the peripheral wall of the motor shaft, so that the strength of the motor shaft is ensured while axial and circumferential positioning is realized; the axial positioning and the circumferential positioning of the motor shaft are realized through the axial action of the pull ring, the pull ring and the motor shaft synchronously rotate, the fastening reliability is ensured, and the operation is convenient in the installation state; through the convex closure cooperation of fastening connection pad and motor shaft, be convenient for the motor shaft when the installation with the location of net dish main part.

Drawings

Fig. 1 is a schematic view of a range hood according to an embodiment of the present invention;

fig. 2 is a sectional view of a range hood according to an embodiment of the present invention;

fig. 3 is a schematic view (installation state) of a filter screen installation structure of a range hood according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of a filter screen mounting structure of a range hood according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is an enlarged view of a portion I of FIG. 5;

fig. 7 is a schematic view of a fastening connector of the filter screen mounting structure of the range hood of the embodiment of the utility model and a fastening self-locking component of the hidden part of the housing;

fig. 8 is a schematic view of a fastening connector of a filter screen mounting structure of a range hood according to an embodiment of the present invention;

fig. 9 is a schematic view of a pull ring assembly of the fastening self-locking assembly of the filter screen mounting structure of the range hood according to the embodiment of the present invention;

fig. 10 is a schematic view of a housing of a fastening self-locking assembly of a filter screen mounting structure of a range hood according to an embodiment of the present invention;

fig. 11 is a schematic view of a motor shaft of the filter screen mounting structure of the range hood according to the embodiment of the present invention;

fig. 12 is a sectional view (disassembled state) of the filter screen mounting structure of the range hood according to the embodiment of the present invention;

fig. 13 is an enlarged view of a part ii of fig. 12.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the invention may be arranged in different orientations, these directional terms are for illustrative purposes only and should not be considered limiting, as "upper", "lower", and the like are not necessarily limited to directions opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 3, a range hood comprises a smoke collecting hood 1 and a fan frame 2 arranged on the smoke collecting hood 1, wherein a fan 3 is arranged in the fan frame 2, an air inlet 11 is formed in the smoke collecting hood 1, a rotary screen disc assembly 4 and a driving mechanism 5 thereof are arranged at the air inlet 11, and the rotary screen disc assembly 4 and the driving mechanism 5 form a filter screen mounting structure. In the embodiment, a top-suction range hood is shown, and alternatively, the filter screen mounting structure may be used in range hoods of other shapes.

The rotating mesh tray assembly 4 comprises a mesh tray 41, a fastening connection tray 42 and a fastening self-locking assembly 43, the mesh tray 41 and the fastening connection tray 42 are fixed, and the fastening self-locking assembly 43 is respectively connected with the output end of the driving mechanism 5 and the fastening connection tray 42, so that the driving mechanism 5 can drive the mesh tray 41 to rotate, as in the present embodiment, around a vertically extending axis. The driving mechanism 5 is fixed in the fan frame 2 through a bracket 6.

Referring to fig. 4 to 11, the rotating net plate assembly 4 further includes a rotating disc 44 and an oil guiding disc 45, the net plate 41 is in a disc shape, the rotating disc 44 and the fastening connection disc 42 are respectively fixed on two axial sides of the net plate 41 to clamp the net plate 41, the rotating disc 44 and the fastening connection disc 42 together form a net plate main body, and the relationship among the three parts can be the same as that in the prior art. The driving mechanism 5 is a motor, which comprises a motor body 51 and a motor shaft 52, wherein the motor shaft 52 passes through the rotating disc 44, the net disc 41 and the fastening connecting disc 42, and is fixed with the fastening self-locking assembly 43, so as to drive the rotating net disc assembly 4 to rotate.

The fastening self-locking assembly 43 includes a housing 431, a pull ring 432, a base 4331, a first resilient member 4341, a second resilient member 4342, a top column 435, a first slider 4361, a second slider 4362, and a locking top block 437. Wherein, the outer shell 431 includes a housing 4311 with an open top and an upper cover 4312 at the top of the housing 4311, and the structure of the split outer shell 431 can facilitate the installation of components in the outer shell 431. A first sleeve 4313 extending up and down is disposed in the housing 4311, a bottom of the first sleeve 4313 extends to a bottom surface of the housing 4311, a top of the first sleeve 4313 extends to the upper cover 4312, and the first sleeve 4313 is used for accommodating the motor shaft 52. The pull ring 432 passes at least partially into the housing 431 from below the housing 431. The base 4331 is movably disposed in the housing 431, the first sleeve 4313 passes through the base 4331 up and down, the first elastic element 4341 is disposed below the base 4331, and is preferably a spring, which can be partially sleeved on the periphery of the portion of the first sleeve 4313 below the base 4331 to function as a spring seat, so as to realize the positioning of the spring, one end of the first elastic element 4341 abuts against the lower surface of the base 4331, and the other end abuts against the bottom surface of the casing 4311. The base 4331 may preferably be provided with a second sleeve 4332, which has a length smaller than that of the first sleeve 4313, and is disposed outside the first sleeve 4313 to guide the base 4331 during movement, wherein the first elastic element 4341 is disposed on the outer periphery of the second sleeve 4332.

The base 4331 is provided with two top pillars 435 at the outer periphery of the first sleeve 4313 (the second sleeve 4332), and is symmetrical to the first sleeve 4313 (the motor shaft 52) and extends upward from the base 4331 beyond the upper cover 4312, so that the top ends of the top pillars 435 are exposed above the upper cover 4312. The fastening connection disc 42 is located above the upper cover 4312, and is formed with an upwardly concave recess 421, and the recess 421 is matched with the top end of the top column 435 for inserting the top end of the top column 435 for circumferential positioning. The top pillar 435 may be made of a soft material such as rubber, etc., and may prevent noise from being generated by fastening a gap between the self-locking unit 43 and the motor shaft 52.

The first sliding block 4361 is disposed on the base 4331, extends upward from the base 4331, and is spaced apart from the top pillar 435, the housing 431 further includes a guide pillar 4314 extending in a transverse direction, and penetrates through the first sliding block 4361 and the second sliding block 4362, the first sliding block 4361 is provided with a guide groove 4343 extending in a direction parallel to the axial direction of the motor shaft 52, the guide groove 4343 can penetrate through the top of the first sliding block 4361, the guide pillar 4314 penetrates through the guide groove 4343, so that the first sliding block 4361 can move up and down relative to the guide pillar 4314, and the second sliding block 4362 can only move in a transverse direction relative to the guide pillar 4343. The second slider 4362 is disposed between the first slider 4361 and the side wall of the housing 4341, and the first slider 4361 is at least at the top engaged with the second slider 4362 in a slant surface, so that when the first slider 4361 slides upward, the second slider 4362 can be pushed to slide toward the side wall of the housing 4311, i.e., so that the up and down movement provided by the pull ring 432 is converted into the lateral movement of the second slider 4362 by the engagement of the first slider 4361 and the second slider 4362. The guide column 4314 is provided with a second elastic element 4342, preferably a spring, one end of the second elastic element 4342 abuts against a side wall of the housing 4311, and the other end abuts against a side of the second slider 4362 away from the first slider 4361, so that the second slider 4362 tends to be away from the side wall of the housing 4311. The first slider 4361 and the second slider 4362 constitute a reversing assembly.

The pull ring 432, the base 4331, the second sleeve 4332, the top column 435 and the first slider 4361 form a pull ring assembly, which acts synchronously. The housing 431 and the locking top block 437 (motor shaft 52) are also rotated synchronously by the arrangement of the guide posts 4314.

The locking top block 437 is disposed on a side of the first slider 4361 away from the second slider 4362, and slides synchronously with the second slider 4362, the locking top block 437 and the second slider 4362 can be connected by a connecting column 4371, and the guide column 4314 passes through the connecting column 4371, so as to guide the sliding of the locking top block 437. The motor shaft 52 has a radially inwardly recessed groove 521 formed on a peripheral wall thereof, and when the second slider 4362 slides in a direction away from the side wall of the housing 4311, the locking top block 437 can pass through the first sleeve 4313 (which may have a hole formed therein) and be pushed into the groove 521, so as to be fixed relative to the motor shaft 52, and when the first slider 4361 slides upward, and the second slider 4362 is pushed in a direction toward the side wall of the housing 4311 by a slant-surface fit, the locking top block 437 moves away from the motor shaft 52, so as to fasten the self-locking assembly 43 to be separated from the motor shaft 52.

In order to balance the stress and stabilize the connection, the first sliding block 4361, the second sliding block 4362 and the locking top block 437 are respectively provided with two blocks, the two blocks are symmetrically arranged relative to the motor shaft 52, the corresponding grooves 521 on the motor shaft 52 are also provided with two blocks, and the first sliding block 4361, the second sliding block 4362 and the locking top block 437 form a group of self-locking structures matched with the grooves 521 on the motor shaft 52.

The motor shaft 52 is further provided with a projection 53, in the embodiment, two projections are provided and are symmetrical relative to the motor shaft 52, a first through hole 422 and a second through hole 423 are formed in the middle of the fastening connecting disc 42, the first through hole 422 is in a circular shape matched with the motor shaft 52, and the second through hole 423 is formed on the periphery of the first through hole 422 and is communicated with the first through hole 422. When the motor shaft 52 passes through the first through hole 422, the projection 53 passes through the second through hole 423, thereby positioning the motor shaft 52 and the fastening coupling 42 circumferentially. Preferably, the projection 53 has two symmetrically arranged with respect to the motor shaft 52, and the second penetration hole 423 has two symmetrically arranged with respect to the first penetration hole 422.

The motor shaft 52 is further provided with a positioning pin 54, and the rotating disc 44 is formed with a positioning groove 441 engaged with the positioning pin 54.

The oil guide disc 45 is fixed with the fan frame 2 or the smoke collecting cover 1, is arranged on the periphery of the net disc 41 and is used for bearing the grease thrown out by the net disc 41.

When mounting, the motor shaft 52 is first passed through the rotating disk 44, and the positioning pin 54 is inserted into the positioning groove 441, so that the motor shaft 52 and the rotating disk 44 can be rotated synchronously. Then the mesh disc 41 and the fastening connecting disc 42 sequentially pass through the motor shaft 52, and when the motor shaft 52 passes through, the lug 53 on the motor shaft 52 is ensured to be matched with the second through hole 423 of the fastening connecting disc 42, so that the motor shaft 52 and the fastening connecting disc 42 are circumferentially positioned and can synchronously rotate; when the fastening self-locking assembly 43 is in a separated state, first, the pull ring 432 is pulled downward, the first sliding block 4361 is driven downward by the base 4331, the second sliding block 4362 is pushed toward the side wall of the housing 4311, so that the locking top block 437 is in a state of contracting close to the first sliding block 4361, at this time, the first elastic member 4341 and the second elastic member 4342 are compressed, then the fastening self-locking assembly 43 is sleeved on the motor shaft 52, the motor shaft 52 penetrates into the first sleeve 4313 until the motor shaft 52 abuts against the top of the first sleeve 4313 (so that the locking top block 437 and the groove 521 on the motor shaft 52 are positioned in the axial direction), then, the pull ring 432 is released, the fastening self-locking assembly 43 is rotated in the direction of the motor shaft 52, under the action of the first elastic member 431, the base 4331 and the first sliding block 4361 are reset upward until the inclined planes of the first sliding block 4361 and the second sliding block 4362 are matched to a minimum extent (no longer contact with each other, so that the first sliding block 4361 and the second sliding block 4362 do not contact with the locking top block 4341 in the axial direction of the shaft 4341, and the rotating disk 4341 is capable of gradually pressing the fastening plate 43437, and the locking top block 4341 and the rotating disk 4341 and the rotating disc 4341 in the axial direction, thereby, the fastening assembly 4341 and the fastening disc 4341 is capable of rotating in the fastening assembly, and the fastening assembly 4341, and the fastening disc 4341 is capable of rotating in the process, and the fastening assembly 4341 in the process, and the rotating in the process, so that the fastening disc 4341 is capable of rotating in the fastening assembly 4341 and the fastening assembly 4341; meanwhile, since the base 4331 faces upwards, when the top column 435 is aligned with the recess 421 on the fastening connection disc 42, it will be pushed into the recess 421 by the first elastic element 4341, so as to realize the circumferential positioning of the fastening self-locking assembly 43 and the fastening connection disc 42, and enable synchronous rotation.

Referring to fig. 5 and 6, in the installed state, the inclined top surface of the first sliding block 4361 is lower than that of the second sliding block 4362, the second sliding block 4362 is not stressed, so that the second elastic member 4342 is in a natural extension state, and the locking top block 437 is pushed into the motor shaft 52

Referring to fig. 12 and 13, when the assembly needs to be disassembled, only a finger is needed to pull the pull ring 432, the pull ring assembly will move downward under the force, at this time, the downward movement of the first slider 4361 will push the second slider 4362 toward the side wall of the housing 4311 until the locking top block 437 exits the groove 521 of the motor shaft 52, and then the parts of the rotating screen disc assembly 4 are disassembled respectively.

"circumferential", "axial", and "radial" refer to directions relative to the motor shaft 52. In the above, the "up and down" is a direction parallel to the axial direction of the motor shaft 52 in the mounted state, and the "lateral" is a radial direction of the motor shaft 52 in the mounted state.

Claims (14)

1. A filter screen mounting structure, includes rotatory net dish subassembly (4) and actuating mechanism (5), rotatory net dish subassembly (4) includes the net dish main part, actuating mechanism (5) are for being used for driving the rotatory motor of net dish main part, the motor includes motor shaft (52) that pass the net dish main part, its characterized in that:

a groove (521) which is recessed inwards in the radial direction is formed on the peripheral wall of the motor shaft (52);

the rotary net plate assembly (4) further comprises a fastening self-locking assembly (43) synchronously rotating with the net plate body, the fastening self-locking assembly (43) comprises a shell (431) and a locking top block (437) arranged in the shell (431) and synchronously rotating with the shell (431), the motor shaft (52) penetrates into the shell (431), the locking top block (437) can move along the radial direction of the motor shaft (52) and keep the trend of jacking into the groove (521), and therefore the fastening self-locking assembly (43) and the motor shaft (52) are axially and circumferentially positioned and then synchronously rotate.

2. The screen mounting structure of claim 1, wherein: the fastening self-locking assembly (43) further comprises a pull ring (432) capable of moving along a direction parallel to the axial direction of the motor shaft (52), a first slide block (4361) and a second slide block (4362) which move synchronously with the pull ring (432), wherein part of the pull ring (432) extends into the shell (431) from one side of the shell (431) far away from the net disc main body, the second slide block (4362) is arranged in the shell (431), the first slide block (4361) is at least partially matched with the inclined surface of the second slide block (4362) to convert the axial movement of the first slide block (4361) into the movement of the second slide block (4362) along the radial direction of the motor shaft (52), the locking top block (437) moves synchronously with the second slide block (4362), and when the first slide block (4361) moves away from the direction of the net disc main body, the second slide block (4362) and the locking top block (437) are pushed to move away from the motor shaft (52).

3. The screen mounting structure of claim 2, wherein: the fastening self-locking assembly (43) further comprises a base (4331) arranged in the shell (431), the pull ring (432) is fixed with the base (4331), the first sliding block (4361) is arranged on the base (4331), and a first elastic piece (4341) is arranged between one sides, far away from the net disc main body, of the base (4331) and the shell (431) so that the base (4331) keeps the trend of moving towards the net disc main body.

4. The screen mounting structure of claim 2, wherein: the housing (431) further comprises a guide post (4314) extending in a radial direction of the motor shaft (52), the guide post (4314) passes through a first slider (4361) and a second slider (4362), the first slider (4361) is movable relative to the guide post (4314) in a direction parallel to an axial direction of the motor shaft (52), while the second slider (4362) is limited by the guide post (4314) to move in the radial direction of the motor shaft (52), the second slider (4362) is disposed between the first slider (4361) and a side wall of the housing (431), and the locking top block (437) is disposed on a side of the first slider (4361) away from the second slider (4362).

5. The screen mounting structure of claim 4, wherein: the guide post (4314) is provided with a second elastic piece (4342) which enables the locking top block (437) to keep the trend of being jacked into the groove (521), and the second elastic piece (4342) is abutted between the second sliding block (4362) and the side wall of the shell (431).

6. The screen mounting structure of claim 4, wherein: the first sliding block (4361) is provided with a guide groove (4343) extending in the direction parallel to the axial direction of the motor shaft (52), and the guide post (4314) penetrates through the guide groove (4343), so that the first sliding block (4361) can move in the direction parallel to the axial direction of the motor shaft (52) relative to the guide post (4314).

7. The screen mounting structure of claim 1, wherein: the housing (431) includes a housing (4311) and a first sleeve (4313) disposed in the housing (4311), the motor shaft (52) is inserted into the first sleeve (4313), and the locking top block (437) is fitted with a groove (521) of the motor shaft (52) through the first sleeve (4313).

8. The screen mounting structure of claim 7, wherein: the fastening self-locking assembly (43) further comprises a base (4331) arranged in the shell (431), the first sleeve (4313) penetrates through the base (4331), a second sleeve (4332) which is shorter than the first sleeve (4313) is arranged on the base (4331), and the second sleeve (4332) is sleeved outside the first sleeve (4313).

9. The screen mounting structure of claim 1, wherein: the locking top blocks (437) are two and are symmetrically arranged relative to the motor shaft (52), and the corresponding grooves (521) on the motor shaft (52) are also two symmetrically arranged.

10. The screen mounting structure of claim 1, wherein: the net disc main body comprises a net disc (41), a rotating disc (44) and a fastening connecting disc (42), the net disc (41) is located between the rotating disc (44) and the fastening connecting disc (42), the motor shaft (52) penetrates through the rotating disc (44) and the fastening connecting disc (42), the fastening connecting disc (42) and the net disc (41) are tightly jacked by the shell (431), a pit (421) is formed in one side, facing the shell (431), of the fastening connecting disc (42), the fastening self-locking assembly (43) further comprises at least two jacking columns (435) which are arranged at intervals and move synchronously with the pull ring (432), the jacking columns (435) extend out of the shell (431) from the inside of the shell (431) and can be jacked into the pit (421), and the fastening self-locking assembly (43) and the fastening connecting disc (42) are circumferentially located.

11. The screen mounting arrangement of claim 10, wherein: the motor shaft (52) is provided with a convex block (53), a first through hole (422) and a second through hole (423) are formed in the middle of the fastening connecting disc (42), the first through hole (422) is in a circular shape matched with the motor shaft (52), the second through hole (423) is formed on the periphery of the first through hole (422) and communicated with the first through hole (422), and the convex block (53) penetrates into the second through hole (423), so that the motor shaft (52) and the fastening connecting disc (42) are circumferentially positioned.

12. The screen mounting structure of claim 10, wherein: the motor shaft (52) is further provided with a positioning pin (54), the rotating disc (44) is provided with a positioning groove (441) matched with the positioning pin (54), the positioning pin (54) is inserted into the positioning groove (441), so that the motor shaft (52) and the rotating disc (44) rotate synchronously, and the positioning pin (54) and the shell (431) press the net disc (41), the rotating disc (44) and the fastening connecting disc (42).

13. A range hood, its characterized in that: use of a screen mounting structure according to any of claims 1 to 12.

14. The range hood of claim 13, wherein: the range hood comprises a fume collecting hood (1), a fan frame (2) arranged on the fume collecting hood (1) and a fan system (3) arranged in the fan frame (2), wherein an air inlet (11) is formed in the fume collecting hood (1), and a rotary screen disc component (4) is arranged at the air inlet (11).

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