CN215860983U - Volute for centrifugal fan, centrifugal fan applying volute and range hood - Google Patents
Volute for centrifugal fan, centrifugal fan applying volute and range hood Download PDFInfo
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- CN215860983U CN215860983U CN202121521119.5U CN202121521119U CN215860983U CN 215860983 U CN215860983 U CN 215860983U CN 202121521119 U CN202121521119 U CN 202121521119U CN 215860983 U CN215860983 U CN 215860983U
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Abstract
The utility model relates to a volute for a centrifugal fan, which comprises a ring wall, a front cover plate and a rear cover plate, and is characterized in that: the annular wall comprises an annular wall body made of porous materials and a rigid support embedded in the annular wall body, and the rigid support is used for supporting the annular wall body. The volute for the centrifugal fan is lighter in weight, less prone to resonance and better in sound absorption and vibration reduction effects. The centrifugal fan with the volute is lighter in weight, smaller in vibration and lower in noise during operation. The range hood with the centrifugal fan is lighter in weight, smaller in vibration and lower in noise during operation.
Description
Technical Field
The utility model relates to the technical field of range hoods, in particular to a volute for a centrifugal fan, and the centrifugal fan and the range hood applying the volute.
Background
The range hood is a common kitchen appliance, and mainly drives airflow through a fan to quickly exhaust oil smoke generated in a cooking process and discharge the oil smoke out of a room, so that the kitchen environment is purified. Among them, the range hood using the centrifugal fan is popular because of large suction force and low noise.
When the range hood operates, the noise mainly comprises motor noise, mechanical noise and pneumatic noise. The motor noise is caused by the vibration of the motor, and the mechanical noise is caused by the vibration transmitted to the volute and the fan frame of the fan by the motor and transmitted to the range hood to cause the resonance between each component of the range hood and the motor, so that the range hood generates larger noise in the operation process. Moreover, because the fan system of the range hood usually adopts a metal plate structure, the fan system is heavier, the wall bearing is large, and the rigidity of the fan system is higher, so that resonance is more easily generated to generate abnormal sound.
At present, two main ways are adopted at the present stage aiming at the noise reduction of mechanical noise of the range hood. The first is to adopt porous sound-absorbing cotton material to set up corresponding structure at the fan system ring wall, volute tongue, fan export or front and back apron and fill to reduce fan system noise, above-mentioned structure has been disclosed by chinese utility model patent "noise reduction device and range hood" that patent number is ZL201620128256.5 (the publication number of grant is CN 205402834U). The second is to adopt rubber pads, damping materials and the like to carry out vibration isolation to the fan system so as to reduce the transmission of vibration and reduce noise, and the structure is disclosed by Chinese utility model patent No. ZL202022274879.2 (No. CN213395491U) of range hood noise reduction device and range hood. In the two vibration reduction modes, due to the limitation of using space, structural form and the like, the vibration reduction material is usually in a thin layer structure, so that the two vibration reduction modes are difficult to achieve ideal vibration reduction and noise reduction effects.
SUMMERY OF THE UTILITY MODEL
The first technical problem to be solved by the present invention is to provide a volute for a centrifugal fan, which has a lighter weight, is not easy to resonate with a motor, and has better sound absorption and vibration reduction effects.
The second technical problem to be solved by the present invention is to provide a centrifugal fan using the volute, which has the advantages of lighter weight, less vibration and lower noise during operation.
The third technical problem to be solved by the present invention is to provide a range hood using the centrifugal fan, which has the advantages of lighter weight, less vibration and lower noise during operation.
The technical scheme adopted by the utility model for solving the first technical problem is as follows: the utility model provides a spiral case for centrifugal fan, includes rampart, front shroud and back shroud, its characterized in that: the annular wall comprises an annular wall body made of porous materials and a rigid support embedded in the annular wall body, and the rigid support is used for supporting the annular wall body.
The rigidity in a rigid scaffold is relative to the flexibility of the porous material. The rigid support may be made of metal and/or plastic, taking into account the strength requirements, weight and cost of the material. The front cover plate and the rear cover plate can be made of plastic with lower Young modulus, so that the structural mode of the volute can be reduced, and the volute has better vibration damping performance.
In order to reduce the pressure bearing of the annular wall body, the front cover plate and/or the rear cover plate are connected with the annular wall through the rigid support. The acting force of the front cover plate and/or the rear cover plate on the annular wall is mainly concentrated on the rigid support, so that the pressure bearing of the annular wall body can be reduced, and the annular wall body is not easy to crack.
To facilitate assembly and disassembly of the volute, the front cover plate and/or the rear cover plate may be removably coupled to the rigid support.
In order to make the support have good support performance and simple structure, the rigid support comprises a first ring body extending along the circumferential direction of the annular wall and ribs basically perpendicular to the circumferential direction of the annular wall. The first ring body is used for fixing the ring wall, and the ribs are used for reinforcing the ring wall. The quantity of first ring body and rib can rationally set up according to actual demand, and usually for the supporting role that makes the rigid support more even, the quantity of first ring body is at least two, and along the circumference interval arrangement of rampart, and the quantity of rib is at least two, and along the circumference interval arrangement of basic perpendicular to rampart.
In order to make the acting force of the front cover plate and/or the rear cover plate on the rigid support more disperse, the front cover plate and/or the rear cover plate are detachably connected with the ribs. If be connected front shroud and/or back shroud and first ring body, then front shroud and/or back shroud are concentrated on two first ring bodies that the interval set up at most to the effort of rigid support, and are connected front shroud and/or back shroud and rib, then can set up a plurality of ribs along the circumference interval of rampart to make the tie point of front shroud and/or back shroud and rigid support more disperse.
In order to facilitate the disassembly and assembly of the volute and simultaneously improve the structural damping of the volute, the rear surface of the front cover plate and/or the front surface of the rear cover plate face to the ribs, the buckles extend to the two ends of the ribs, and bayonets for the buckles on the corresponding sides to be correspondingly clamped are arranged at the two ends of the ribs respectively. Compare with conventional screw fastening, the card of buckle and bayonet socket joins in marriage the mode and can make between rampart and the front shroud, be connected between rampart and the back shroud simpler, and the spiral case equipment is more convenient, and moreover, the friction between the spare part is more, can be stronger to the decay effect of vibration, can reduce the structural mode of spiral case to can promote structural damping, make the damping effect better.
In order to enable the connection between the front cover plate and the annular wall and/or between the rear cover plate and the annular wall to be firmer, the rear surface of the front cover plate and/or the front surface of the rear cover plate extend towards the ribs to form inserting portions, and the front ends and/or the rear ends of the ribs are provided with inserting holes for inserting the inserting portions on the corresponding sides. The front cover plate is connected with the annular wall and/or the rear cover plate is connected with the annular wall through the matching of the insertion part and the insertion hole, so that the clamping buckle is less prone to falling out of the clamping opening, and the front cover plate is less prone to being separated from the annular wall and/or the rear cover plate is less prone to being separated from the annular wall.
In order to make the connection structure between the front cover plate and the ring wall and/or between the rear cover plate and the ring wall more compact, the insertion portion is in a ring structure with a notch, wherein at least part of the snap is formed at the corresponding notch, and at least part of the bayonet is correspondingly formed on the hole wall of the insertion hole.
Due to the existence of machining errors and assembly errors of volute components, when the volute is assembled, deviation is generated between the insertion part and the insertion hole, and the volute cannot be assembled normally. In order to eliminate the influence of machining errors and assembly errors on the assembly of the volute, the insertion part comprises at least two insertion strips which are arranged at intervals, and the at least two insertion strips surround the annular structure. The insertion part is set into at least two insertion strips arranged at intervals, so that the insertion strips can be properly deformed under the extrusion action, the insertion part can be smoothly inserted into the insertion hole, the insertion part has better adaptability, and the influence of machining errors and assembly errors on the assembly of the volute is eliminated.
In order to enable the insertion portion to enter the insertion hole more smoothly, the outer annular surface of the insertion portion gradually approaches the inner annular surface of the insertion portion in the extending direction of the insertion portion. The design can make the circumference of the outer ring surface gradually reduce along the extension direction of the insertion part, so that the extension tail end of the insertion part can enter the insertion hole more smoothly, and the connection between the insertion part and the insertion hole is more smooth.
In order to facilitate the radial limit of the annular wall, a second annular body extends from the periphery of the front cover plate and/or the periphery of the rear cover plate to the annular wall, the buckle is formed on the second annular body on the corresponding side, grooves for embedding the second annular body on the corresponding side are formed in the front side and the rear side of the annular wall body, and the ribs penetrate through the rear surface and/or the front surface of the corresponding positions of the grooves; and a third ring body which is abutted against the inner ring surface of the ring wall body extends towards the ring wall from the rear surface of the front cover plate and/or the front surface of the rear cover plate. In order to make the annular wall better in vibration reduction effect, the thickness of the annular wall body is larger, the front cover plate and/or the rear cover plate are/is partially covered on the side surface of the annular wall, the mass of the front cover plate and/or the rear cover plate can be reduced, and the volute is lighter.
In order to make the supporting action of the rigid support on the annular wall more uniformly distributed in the radial direction of the annular wall, the first annular body and the ribs are arranged at intervals in the radial direction of the annular wall.
In order to make the supporting performance of the rigid support better, the first ring body and the ribs are integrally connected.
After the volute is installed, in order to ensure that the annular wall body is not easy to crack due to the acting force of the fan frame and the air outlet plate on the annular wall, the first annular body is provided with a convex part exposed on the outer annular surface of the annular wall body, and the convex part is provided with a first connecting hole used for being connected with the fan frame; the end part of the first ring body is provided with a second connecting hole exposed at the top of the annular wall body, and the second connecting hole is used for being connected with an air outlet plate.
At present, the types of range hoods on the market mainly comprise a top suction type range hood and a near suction type range hood, wherein for the top suction type range hood, a rear cover plate in a volute is provided with a mounting hole, a motor frame on which a power supply motor is mounted is fixed in the mounting hole, and the rear cover plate of the volute needs to provide a larger supporting effect for the motor; for the near-suction range hood, the rear cover plate in the volute is not provided with a mounting hole, only the mounting groove for inserting the power supply motor is arranged in the volute, and the rear cover plate of the volute only needs to provide a smaller supporting effect for the motor. In order to make the volute vibration damping and noise reducing effect better, a mounting groove for inserting a motor therein is formed on the front surface of the rear cover plate, and the rear cover plate is made of a porous material. The motor is inserted into the mounting groove, so that the motor is wrapped in the porous material, the porous material with vibration reduction and noise reduction performance is closer to the vibration source motor, the transmission of vibration is reduced, and the vibration reduction effect of the fan system is better.
In order to enable the ring wall to have good strength and toughness, the porous material is at least one of polyurethane, sponge, sound-absorbing cotton and resin, and the density of the porous material is 35-60 Kg/m3。
The technical scheme adopted by the utility model for solving the second technical problem is as follows: a centrifugal fan, its characterized in that: a volute for a centrifugal fan as described above is applied.
The technical scheme adopted by the utility model for solving the third technical problem is as follows: a range hood, its characterized in that: a centrifugal fan as described above is applied.
Compared with the prior art, the utility model has the advantages that: the annular wall body is made of porous materials with sound absorption function, the rigid support is embedded in the annular wall body to support the annular wall body, the annular wall can be lighter in weight, so that the volute is lighter, the range hood is lighter in weight, the wall can bear smaller pressure after the range hood is installed, the rigidity of the porous materials is lower, the volute is not easy to resonate with the motor, and the vibration transmitted to the centrifugal fan by the volute is reduced, in addition, compared with the mode that vibration absorption materials such as sound absorption cotton and rubber pads are arranged around the volute, the annular wall body is closer to the vibration source motor, the vibration is directly attenuated by the annular wall body, the limitation of the annular wall body of the volute by the space and the structure of a fan system is small, the sound absorption space of the whole annular wall body is larger, and the vibration absorption performance of the porous materials can be better exerted, the volute used for the centrifugal fan has better vibration reduction effect; the centrifugal fan with the volute is lighter in weight, and the volute transmits small vibration during operation, so that the centrifugal fan vibrates less and has lower noise; the range hood with the centrifugal fan is lighter in weight, and the centrifugal fan transmits small vibration during operation, so that the centrifugal fan vibrates less and the noise is lower.
Drawings
FIG. 1 is a perspective view of the structure of embodiment 1 of the present invention;
FIG. 2 is a perspective view of the embodiment 1 of the present invention with the annular wall body removed;
FIG. 3 is a front view of embodiment 1 of the present invention with the body of the annular wall removed;
FIG. 4 is a perspective view of the ring wall in example 1 of the present invention;
FIG. 5 is a perspective view of a rib in embodiment 1 of the present invention;
fig. 6 is a perspective view of a front cover plate in embodiment 1 of the present invention;
FIG. 7 is an enlarged view taken at A in FIG. 6;
fig. 8 is a perspective view of a rear cover plate in embodiment 1 of the present invention;
fig. 9 is an enlarged view at B in fig. 8.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
Example 1
As shown in fig. 1-9, is a first preferred embodiment of the present invention.
As shown in fig. 1, the volute for the centrifugal fan in the present embodiment includes a circumferential wall 100, a front cover plate 1, and a rear cover plate 2. The front cover plate 1 is located in front of the annular wall 100, the rear cover plate 2 is located behind the annular wall 100, and the front cover plate 1 and the rear cover plate 2 are both detachably connected with the annular wall 100, so that the volute is convenient to assemble and disassemble.
As shown in fig. 2 and 4, the annular wall 100 in the present embodiment includes an annular wall body 3 and a rigid support 4, wherein the annular wall body 1 is made of a porous material, the rigid support 4 is embedded inside the annular wall body 3, and the rigid support 4 is used for supporting the annular wall body 3. The cellular material in this example is polyurethane and the density of the cellular material is 35Kg/m3. The rigidity in this embodiment is relative to the flexibility of the porous material. In this embodiment, the processing method of the annular wall 100 is as follows: the rigid support 4 is placed in a foaming mold cavity of the annular wall body 3, and demolding is carried out after the porous material is foamed and molded.
In the embodiment, the volute for the centrifugal fan is lighter in weight, so that the mass of the range hood is lighter, the wall can bear smaller pressure after the range hood is installed, the rigidity of the porous material is lower, the volute is not easy to resonate with a motor, and vibration transmitted to the centrifugal fan by the volute is reduced; in the present embodiment, the rigid support 4 includes a first ring body 41 and a rib 42, wherein the first ring body 41 extends along the circumferential direction of the annular wall 100, so as to be used for fixing the annular wall 100; the ribs 42 are substantially perpendicular to the circumferential direction of the annular wall 100 (see fig. 2) and thus serve to reinforce the annular wall 100. The first ring 41 and the ribs 42 are spaced radially of the annular wall (see fig. 3) so that the supporting action of the rigid support 4 on the annular wall 100 is distributed more uniformly radially of the annular wall 100. In the present embodiment, the number of the first ring bodies 41 is 3, and the first ring bodies are arranged at intervals along the circumferential direction of the annular wall 100, and the number of the ribs 42 is 7, and the ribs are arranged at intervals along the circumferential direction substantially perpendicular to the annular wall 100 (see fig. 2), so that the supporting effect of the rigid support 4 on the annular wall body 3 can be more uniform. In order to meet the strength requirement, weight and cost of the material, the first ring body 41 is a sheet metal ring, and the ribs 42 are plastic strips.
In this embodiment, the front cover plate 1 and the rear cover plate 2 are detachably connected to the annular wall 100 through the rigid support 4, so that the acting force of the front cover plate 1 and the rear cover plate 2 on the annular wall 100 is mainly concentrated on the rigid support 4, and the annular wall body 3 is prevented from bearing pressure and being easily cracked.
In this embodiment, the rear surface of the front cover plate 1 extends toward each rib 42 to form a first insertion portion 11 (see fig. 7), and the front end of each rib 42 is provided with a first insertion hole 421 (see fig. 4-5) into which each first insertion portion 11 is inserted correspondingly. Each first inserting portion 11 is the annular structure who has first breach 111, each first breach 111 department has first buckle 112 (see fig. 7) towards each rib 42 extension, it has bayonet 422 (see fig. 5) that each first buckle 112 of confession corresponds the card to go into to open on the pore wall of each first jack 421, thereby make the connection of front shroud 1 and rigid support 4 more firm, and, the friction between the spare part is more, can be stronger to the damping effect of vibration, can reduce the structure mode of spiral case, thereby can promote structural damping, make the damping effect better. Each first insertion portion 11 includes at least two first insertion strips 113 arranged at intervals, and the at least two first insertion strips 113 enclose to form an annular structure, so that the first insertion strips 113 can be properly deformed under the extrusion action, and each first insertion portion 11 can be smoothly inserted into each first insertion hole 421, so that each first insertion portion 11 has better adaptability, and the influence of machining errors and assembly errors on the assembly of the volute casing is eliminated. In the present embodiment, the number of the first blades 113 of each first insertion portion 11 is 4 (see fig. 7). The outer annular surface 114 of each first insertion portion 11 is gradually closer to the inner annular surface 115 of each first insertion portion 11 in the extending direction of each first insertion portion 11 (see fig. 7), so that the circumference of the outer annular surface 114 of each first insertion portion 11 is gradually reduced in the extending direction of each first insertion portion 11, the extending end of each first insertion portion 11 can enter each first insertion hole 421 more smoothly, and the connection between each first insertion portion 11 and the first insertion hole 421 is more smoothly performed.
In order to limit the annular wall 100 in the radial direction, the periphery of the front cover plate 1 extends towards the annular wall 100 to form a front second annular body 12, each first insertion part 11 is formed on the front second annular body 12 (see fig. 6-7), the front side of the annular wall body 3 is provided with a first groove 33 for embedding the front second annular body 12, and the front part of each rib 42 penetrates through the rear surface of the corresponding part of the first groove 31 (see fig. 4); the rear face of the front cover plate 1 extends towards the annular wall 100 with a front third ring 13 (see figures 6-7) which abuts against the inner annular face 31 of the annular wall body 3.
Similarly, the front surface of the rear cover plate 2 extends toward each rib 42 to form a second insertion portion 21 (see fig. 9), and the rear end of each rib 42 is provided with a second insertion hole 423 (see fig. 5) into which each second insertion portion 21 is inserted. Each second insertion portion 21 is of an annular structure having a second notch 211, a second snap 212 (see fig. 9) extends from each second notch 211 toward each rib 42, and a bayonet 424 (see fig. 5) for each second snap 212 to be correspondingly snapped into is opened on a hole wall of each second insertion hole 423. Each second insertion portion 21 includes at least two second insertion bars 213 spaced apart from each other, and at least two second insertion bars 213 enclose an annular structure. In the present embodiment, the number of the second cuttings 213 of each second insertion portion 21 is 4 (see fig. 9). The outer annular surface 214 of each second insertion portion 21 gradually approaches the inner annular surface 215 of each second insertion portion 21 in the extending direction of each second insertion portion 21 (see fig. 9).
The periphery of the rear cover plate 2 extends to form a rear second ring 22 towards the annular wall 100, each second insertion portion 21 is formed on the rear second ring 22 (see fig. 8-9), the rear side of the annular wall body 3 is provided with a second groove 34 (see fig. 4) for embedding the rear second ring 22, and the rear portion of each rib 42 penetrates through the rear surface (not shown in the figure) of the corresponding second groove 34; the front face of the rear cover plate 2 extends towards the annular wall 100 with a rear third ring 23 (see figures 8-9) which abuts against the inner annular face 31 of the annular wall body 3.
As shown in fig. 1-2 and 4, each first ring body 41 is provided with a convex portion 411 exposed on the outer annular surface 32 of the ring wall body 3, and each convex portion 411 is provided with a first connection hole 412 for connecting with a fan frame; the end of each first ring 41 is provided with a second connection hole 413 exposed at the top of the annular wall body 3, and the second connection hole 413 is used for being connected with the air outlet plate, so that the annular wall body 3 is not easily cracked due to the acting force of the fan frame and the air outlet plate on the annular wall 100.
In this embodiment, the middle of the front cover plate 1 is provided with the air inlet 14, the middle of the rear cover plate 2 is provided with the mounting hole, and the motor bracket 5 is fixed in the mounting hole, so that the volute in this embodiment is more suitable for the centrifugal fan of the ceiling-mounted range hood. The front cover plate 2 and the rear cover plate 3 in the embodiment are both made of plastic, and the plastic has the physical characteristic of low Young modulus, so that the structural modes of the front cover plate 2 and the rear cover plate 3 can be reduced, and the front cover plate 2 and the rear cover plate 3 have good vibration damping performance.
The centrifugal fan in this embodiment is applied with the aforementioned volute (not shown in the figure).
The range hood in this embodiment is applied with the centrifugal fan (not shown in the figure).
Example 2
This example differs from example 1 in that: the first ring 41 and the ribs 42 are integrally connected, so that the rigid support 4 is a single piece.
Example 3
This example differs from example 1 in that: the middle part of the rear cover plate 2 is not provided with a mounting hole, and only the front surface of the rear cover plate 2 is provided with a mounting groove for inserting a motor therein, so that the volute in the embodiment is more suitable for a centrifugal fan of a near-suction range hood. The rear cover plate 2 is made of a porous material.
Example 4
This example differs from example 1 in that: the density of the porous material is 45Kg/m3。
Example 5
This example differs from example 1 in that: the density of the porous material is 55Kg/m3。
Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.
Claims (18)
1. A spiral casing for a centrifugal fan, comprising a circumferential wall (100), a front cover plate (1) and a rear cover plate (2), characterized in that: the annular wall (100) comprises an annular wall body (3) made of porous materials and a rigid support (4) embedded in the annular wall body (3), and the rigid support (4) is used for supporting the annular wall body (3).
2. The volute for a centrifugal fan of claim 1, wherein: the front cover plate (1) and/or the rear cover plate (2) are connected with the annular wall (100) through the rigid support (4).
3. The volute for a centrifugal fan of claim 2, wherein: the front cover plate (1) and/or the rear cover plate (2) are detachably connected with the rigid support (4).
4. The volute for a centrifugal fan of claim 3, wherein: the rigid support (4) comprises a first ring body (41) extending along the circumferential direction of the annular wall (100) and a rib (42) basically perpendicular to the circumferential direction of the annular wall (100).
5. The volute for a centrifugal fan of claim 4, wherein: the front cover plate (1) and/or the rear cover plate (2) are detachably connected with the ribs (42).
6. The volute for a centrifugal fan of claim 5, wherein: the rear surface of front shroud and/or the front surface orientation of rear shroud (2) rib (42) extend and have buckle (112, 212), the both ends of rib (42) are equipped with bayonet socket (422, 424) that the buckle (112, 212) that supply to correspond the side corresponds the card income respectively.
7. The volute for a centrifugal fan of claim 6, wherein: the rear surface of the front cover plate (1) and/or the front surface of the rear cover plate (2) extend towards the ribs (42) to form inserting portions (11, 21), and inserting holes (421, 423) for inserting the inserting portions (11, 21) on the corresponding sides are formed in the front ends and/or the rear ends of the ribs (42).
8. The volute for a centrifugal fan of claim 7, wherein: the insertion part (11, 21) is in a ring structure with notches (111, 211), wherein at least part of the buckles (112, 212) are formed at the corresponding notches (111, 211), and at least part of the bayonets (422, 424) are correspondingly formed on the hole wall of the insertion hole (421, 423).
9. The volute for a centrifugal fan of claim 8, wherein: the insertion part (11, 21) comprises at least two insertion bars (113, 213) arranged at intervals, and the at least two insertion bars (113, 213) enclose the annular structure.
10. The volute for a centrifugal fan of claim 8, wherein: the outer annular surface (114, 214) of the insertion portion (11, 21) is gradually closer to the inner annular surface (115, 215) of the insertion portion (11, 21) in the extension direction of the insertion portion (11, 21).
11. The volute for a centrifugal fan of claim 6, wherein: the periphery of the front cover plate (1) and/or the periphery of the rear cover plate (2) extend towards the annular wall (100) to form second annular bodies (12, 22), the buckles (112, 212) are formed on the second annular bodies (12, 22) on the corresponding sides, grooves (33, 34) for embedding the second annular bodies (12, 22) on the corresponding sides are formed in the front side and the rear side of the annular wall body (3), and the ribs (42) penetrate through the rear surfaces and/or the front surfaces of the grooves (33, 34) at the corresponding positions; and third ring bodies (13, 23) which are abutted against an inner ring surface (31) of the annular wall body (3) extend from the rear surface of the front cover plate (1) and/or the front surface of the rear cover plate (2) towards the annular wall (100).
12. The volute for a centrifugal fan of claim 4, wherein: the first ring body (41) and the ribs (42) are arranged at intervals along the radial direction of the annular wall (100).
13. The volute for a centrifugal fan of claim 4, wherein: the first ring body (41) and the ribs (42) are integrally connected.
14. The volute for a centrifugal fan of claim 4, wherein: the first ring body (41) is provided with a convex part (411) exposed on the outer ring surface (32) of the annular wall body (3), and the convex part (411) is provided with a first connecting hole (412) used for being connected with the fan frame; the end part of the first ring body (41) is provided with a second connecting hole (413) exposed at the top of the annular wall body (3), and the second connecting hole (413) is used for being connected with an air outlet plate.
15. The volute for a centrifugal fan of claim 1, wherein: the front surface of the rear cover plate (2) is provided with an installation groove for inserting a motor therein, and the rear cover plate (2) is made of porous material.
16. The volute for a centrifugal fan of any of claims 1 to 15, wherein: the porous material is at least one of polyurethane, sponge, sound-absorbing cotton and resin, and the density of the porous material is 35-60 Kg/m3。
17. A centrifugal fan, its characterized in that: a volute for a centrifugal fan according to any one of claims 1 to 16 is applied.
18. A range hood, its characterized in that: use is made of a centrifugal fan according to claim 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121521119.5U CN215860983U (en) | 2021-07-05 | 2021-07-05 | Volute for centrifugal fan, centrifugal fan applying volute and range hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121521119.5U CN215860983U (en) | 2021-07-05 | 2021-07-05 | Volute for centrifugal fan, centrifugal fan applying volute and range hood |
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| CN215860983U true CN215860983U (en) | 2022-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963367A (en) * | 2022-06-28 | 2022-08-30 | 珠海格力电器股份有限公司 | Airflow generation device and humidifier |
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2021
- 2021-07-05 CN CN202121521119.5U patent/CN215860983U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963367A (en) * | 2022-06-28 | 2022-08-30 | 珠海格力电器股份有限公司 | Airflow generation device and humidifier |
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