CN215861006U

CN215861006U - Connecting structure of air inlet ring and volute for centrifugal fan

Info

Publication number: CN215861006U
Application number: CN202121628486.5U
Authority: CN
Inventors: 赵民旺; 吴灵辉; 程阳林
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-02-18
Anticipated expiration: 2031-07-16

Abstract

The utility model relates to a connecting structure of an air inlet ring and a volute for a centrifugal fan, which comprises: a volute having an air inlet; the air inlet ring is connected to an air inlet of the volute and comprises an annular flow guide part and an annular wall extending outwards from the flow guide part along the radial direction; the annular wall with the spiral case links together through bumping detain subassembly detachably, it detains the subassembly including locating to bump the knot of annular wall inboard and locate supply on the spiral case the socket that the knot inserted wherein. Adopt to bump the screw that detains connected mode can reduce most part quantity, it is very convenient to install, when installing, only needs perpendicular spiral case apron direction to press down the air inlet circle for bump and detain and get into the socket and can accomplish fixedly, two screw holes of follow-up accessible strengthen fixedly, prevent the problem of droing that probably appears.

Description

Connecting structure of air inlet ring and volute for centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a connecting structure of an air inlet ring and a volute for a centrifugal fan.

Background

The range hood is a kitchen appliance for purifying the kitchen environment, and is used for rapidly exhausting oil fume harmful to human bodies and improving the kitchen environment. The volute is an important component of the range hood and generally comprises a front cover plate, a rear cover plate and a circular wall arranged between the front cover plate and the rear cover plate, and an air inlet ring is arranged at an air inlet of the front cover plate. The existing volute is made of metal materials, so that the integral structure of the volute is heavy, the manufacturing cost is high, and particularly, the front cover plate and the air inlet ring are generally assembled together in a screw connection mode, and the assembly and disassembly are very inconvenient.

Therefore, the chinese patent with application number CN201010576162.1 (No. CN102478269B) discloses a volute and a range hood provided with the same, wherein the volute comprises a front baffle, a coaming, a rear baffle, and an air inlet ring, the air inlet ring is clamped at an air inlet of the front baffle, and specifically, at least one clamping protrusion is arranged on the surface of the air inlet ring facing the air inlet; the front baffle is provided with clamping notches with the same number as the clamping bulges at the air inlet, the clamping notches correspond to the clamping bulges one to one, and the corresponding clamping bulges penetrate through the clamping notches; the inner surface of the front baffle is provided with clamping channels with the same number as the clamping bulges at the air inlet, the clamping channels correspond to the clamping notches one by one, and the clamping channels are connected with the corresponding clamping notches; the clamping protrusions can penetrate through the corresponding clamping gaps, so that the air inlet ring rotates around the circle center of the air inlet, and the clamping protrusions can enter the corresponding clamping channels, so that the air inlet ring is clamped on the front baffle.

The spiral case in the above-mentioned patent still has certain not enough with the connection structure of air inlet circle, the spiral case is connected through the mode of rotatory block with the air inlet circle, and in order to avoid the air inlet circle after the installation to deviate from in the opposite direction, need set up the corresponding anti-falling back arch in the block passageway, this kind of structure setting makes the dismouting process of air inlet circle still have certain difficulty, especially, anti-falling back bellied setting, cause the user to need just enable the protruding reverse withdrawal of block with the help of specialized tool, it is more time-consuming, hard, assembly efficiency is not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a connecting structure of an air inlet ring and a volute for a centrifugal fan, which is convenient to disassemble and assemble and high in assembling efficiency aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a connection structure of air inlet circle and spiral case for centrifugal fan, includes:

a volute having an air inlet;

the air inlet ring is connected to an air inlet of the volute and comprises an annular flow guide part and an annular wall extending outwards from the flow guide part along the radial direction;

the annular wall with the spiral case links together through bumping detain subassembly detachably, it detains the subassembly including locating to bump the knot of annular wall inboard and locate supply on the spiral case the socket that the knot inserted wherein.

The latch can adopt various existing latch structures such as a latch lock, a spring clamping door latch and the like, and the latch comprises a plurality of elastic support arms, each elastic support arm is basically V-shaped, and the notches of the elastic support arms are arranged in pairs and oppositely, so that an elastic expansion part with a cross section gradually contracted from the middle to two ends is formed jointly, the elastic expansion part is inserted into the socket and can act on the inner side of the periphery of the volute air inlet, and the annular wall is attached to the outer side of the periphery of the volute air inlet in a pre-pressure manner.

The socket is a square opening for matching with each elastic support arm. After the latch is inserted into the corresponding socket, each elastic support arm can prop against one side of the square opening.

In order to ensure the firm connection between the annular wall of the air inlet ring and the volute, at least two groups of the latch assemblies are arranged at equal intervals along the circumferential direction of the annular wall.

As an improvement, the air inlet ring is a plastic piece. Utilize the low-cost advantage of plastics on the one hand, change the material of air intake circle into plastics, reduce production manufacturing cost, on the other hand air intake circle adopts the working of plastics, can have the noise reduction effect about 0.2dB than current sheet metal component. Because the volute is the sheet metal component, when the air inlet circle also is the sheet metal component, its natural frequency probably is not far away with the difference of volute, and after the change material, the natural frequency of plastics air inlet circle is far away with the difference of sheet metal component volute, can not take place obvious resonance phenomenon at range hood work area for the total noise level descends to some extent.

In order to facilitate processing and further reduce production cost, the air inlet ring and the elastic support arm are plastic parts which are integrally formed.

In order to further ensure the fixing firmness of the air inlet ring, the annular wall is connected with the volute casing through a fastener.

In order to realize the fixation between the annular wall and the volute through a fastener, the periphery of the air inlet of the volute is provided with two screw holes which are symmetrically arranged, and the fastener comprises two screws which are used for penetrating through the annular wall of the air inlet ring and connecting into the corresponding screw holes.

In order to facilitate an operator to quickly find the position of the latch on the air inlet ring during assembly so as to be quickly inserted into the socket, the front surface of the air inlet ring corresponding to the latch also has an indicating mark for indicating the position of the latch.

Compared with the prior art, the utility model has the advantages that: the annular wall of air inlet circle links together through bumping knot subassembly detachably with the spiral case, and this kind bumps and detains connected mode, can reduce the screw of most part quantity, and it is very convenient to install, when installing, only needs perpendicular spiral case apron direction to press down the air inlet circle for bump and detain and get into the socket and can accomplish fixedly, and two screw holes of follow-up accessible strengthen fixedly, prevent the problem that drops that probably appears.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic perspective view of an air inlet ring according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of an embodiment of the present invention at the latch assembly (the latch assembly in an assembled state).

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction 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 4, a connection structure of an air inlet ring and a volute for a centrifugal fan includes a volute 10 and an air inlet ring 20, wherein the volute 10 includes a front cover plate 11, a rear cover plate 12 and a ring wall 13, the front cover plate 11 and the rear cover plate 12 are disposed opposite to each other, and the ring wall 13 is disposed between the front cover plate 11 and the rear cover plate 12. The front cover plate 11 has an air inlet 100, and the air inlet ring 20 is disposed at the air inlet 100 of the front cover plate 11.

Referring to fig. 3, the air inlet ring 20 includes a guide portion 21 having an annular shape and an annular wall 22 extending radially outward from an outer periphery of the guide portion 21. Wherein the flow guide portion 21 may be provided in a curved wall structure having a cross section in an arc shape convex outward.

Referring to fig. 2 and 3, the annular wall 22 of the air inlet ring 20 of the present embodiment is detachably connected to the volute casing 10 by the latch 31 assembly. The latch 31 assembly includes a latch 31 disposed inside the annular wall 22 and a socket 111 disposed on the volute casing 10 for inserting the latch 31 therein. Specifically, the latch 31 assembly of the present embodiment is provided with four sets, wherein the insertion opening 111 is a square opening and is uniformly spaced along the circumference of the air inlet 100. The latch 31 includes a plurality of elastic arms 32, each of the elastic arms 32 is substantially V-shaped, and the plurality of elastic arms 32 are arranged along a circular track on the annular wall 22 to collectively form an elastic expansion portion 33 whose cross section gradually contracts from the middle to both ends, and specifically, a latch 31 of the present embodiment includes four elastic arms 32, and the notches of the four elastic arms 32 are arranged opposite to each other in pairs, thereby forming the elastic expansion portion 33. The front part of the elastic expansion part 33 can be smoothly inserted into the socket 111, the middle protruding part of the elastic expansion part 33 is pressed by the inner edge of the socket 111 to shrink in the process of inserting the elastic expansion part 33 into the socket 111, and in the state after the elastic expansion part 33 is inserted into the socket 111, the middle protruding part of the elastic expansion part 33 passes through the socket 111 and is located inside the peripheral edge of the socket 111, because the rear part of the elastic expansion part 33 can act on the inner wall of the volute 10 (i.e. inside the peripheral edge of the socket 111) from inside to outside, the annular wall 22 can be attached to the outer side of the peripheral edge of the air inlet 100 of the volute 10 in a pre-pressing manner, as shown in fig. 4 in detail.

The air inlet ring 20 of the present embodiment is a plastic part, and the elastic support arm 32 is also a plastic part, which are integrally formed, for example, by integral injection molding. Utilize the low-cost advantage of plastics on the one hand, change the material of air intake circle 20 into plastics, reduce production manufacturing cost, on the other hand air intake circle 20 adopts the working of plastics, can have the noise reduction effect about 0.2dB than current sheet metal component. Because the volute casing 10 is a sheet metal part, when the air inlet ring 20 is also a sheet metal part, the natural frequency of the air inlet ring may not be far different from that of the volute casing 10, and after the material is changed, the natural frequency of the plastic air inlet ring 20 is far different from that of the sheet metal part volute casing 10, so that the obvious resonance phenomenon cannot occur in the working area of the range hood, and the overall noise level is reduced to some extent.

In order to further ensure the fixing firmness of the air inlet ring 20, the annular wall 22 of the air inlet ring 20 and the volute casing 10 are connected through a fastener. Specifically, the peripheral edge of the air inlet 100 of the volute casing 10 has two screw holes 110 symmetrically arranged, and the annular wall 13 of the air inlet ring 20 has through holes 220 corresponding to the two screw holes 110, and is connected to the corresponding screw holes 110 at two places by screws (not shown) for passing through the through holes 220 of the annular wall 22 of the air inlet ring 20.

The front surface of the air inlet ring 20 corresponding to the latch also has an indication mark 41 for indicating the position of the latch. The arrangement of the indication mark 41 can facilitate an operator to quickly find the latch position on the air inlet ring 20 during assembly so as to be quickly inserted into the socket 111, and further improve the assembly efficiency.

The annular wall 22 of the air inlet ring 20 of this embodiment links together through bumping buckle 31 subassembly detachably with spiral case 10, and this kind bumps buckle 31 connected mode, can reduce most part quantity's screw, and it is very convenient to install, when installing, only needs perpendicular spiral case 10 apron direction to press down air inlet ring 20 for bumping the buckle and getting into socket 111 and can accomplishing fixedly, and two screw holes 110 of follow-up accessible strengthen fixedly, prevent the problem that drops that probably appears.

Claims

1. The utility model provides a connection structure of air inlet circle and spiral case for centrifugal fan, includes:

a volute (10) having an air inlet (100);

the air inlet ring (20) is connected to an air inlet (100) of the volute (10) and comprises an annular flow guide part (21) and an annular wall (22) extending outwards from the flow guide part (21) in the radial direction;

the method is characterized in that: annular wall (22) with spiral case (10) link together through hasp subassembly detachably, the hasp subassembly is including locating hasp (31) of annular wall (22) inboard and locate on spiral case (10) supply hasp (31) insert socket (111) wherein.

2. The connection structure of the air inlet ring and the volute casing for the centrifugal fan according to claim 1, wherein: the latch buckle (31) comprises a plurality of elastic support arms (32), each elastic support arm (32) is basically V-shaped, notches of the elastic support arms (32) are arranged in pairs in an opposite mode, so that an elastic expansion portion (33) with the cross section gradually contracting from the middle to two ends is formed together, the elastic expansion portion (33) can act on the inner side of the periphery of the air inlet (100) of the volute (10) in the state that the elastic expansion portion (33) is inserted into the socket (111), and the annular wall (22) is attached to the outer side of the periphery of the air inlet (100) of the volute (10) in a pre-pressure mode.

3. The connection structure of the air inlet ring and the volute casing for the centrifugal fan according to claim 1, wherein: the socket (111) is a square opening.

4. The connection structure of the air inlet ring and the volute casing for the centrifugal fan according to claim 1, wherein: the latch assemblies are arranged in at least two groups and are evenly spaced along the circumferential direction of the annular wall (22).

5. The connection structure of the air inlet ring and the volute casing for the centrifugal fan according to claim 1, wherein: the air inlet ring (20) is a plastic piece.

6. The structure of claim 2, wherein the air inlet ring is connected to the volute casing by a connecting member, the connecting member comprising: the air inlet ring (20) and the elastic support arm (32) are both plastic pieces which are integrally formed.

7. The structure of any one of claims 1 to 6 for connecting an air inlet ring and a volute casing of a centrifugal fan, wherein: the annular wall (22) is also connected to the volute (10) by fasteners.

8. The structure of claim 7, wherein the air inlet ring is connected to the volute casing by a connecting member, the connecting member comprising: the periphery of the air inlet (100) of the volute (10) is provided with two screw holes (110) which are symmetrically arranged, and the fastening piece comprises two screws which are used for penetrating through the annular wall (22) of the air inlet ring (20) and connecting into the screw holes (110) corresponding to the annular wall.

9. The structure of any one of claims 1 to 6 for connecting an air inlet ring and a volute casing of a centrifugal fan, wherein: the front surface of the air inlet ring (20) is provided with an indicating mark (41) corresponding to the latch and used for indicating the position of the latch.