CN217441725U

CN217441725U - Fume exhaust fan

Info

Publication number: CN217441725U
Application number: CN202220106018.XU
Authority: CN
Inventors: 陈旭斌; 吴灵辉
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-09-16
Anticipated expiration: 2032-01-13

Abstract

The utility model relates to a range hood, include: a housing; the fan is arranged in the shell and comprises a volute, an impeller and a motor, the volute is provided with a front air inlet, and the impeller is in transmission connection with an output shaft of the motor; the main body part of the motor is positioned outside the volute and is fixed relative to the shell; the front side of the casing is provided with a main air suction opening opposite to the front air inlet, and the bottom of the casing is provided with an auxiliary air suction opening. Because the main part of the motor is positioned outside the volute, the front air inlet or the rear air inlet of the volute cannot be blocked, the problem of uneven air inlet on the front side and the rear side of the volute caused by the fact that the motor occupies the air inlet area of the front air inlet or the rear air inlet in the prior art is effectively solved, and the noise problem of the fan is reduced. The auxiliary air suction opening is formed in the bottom of the casing, so that air flows through the auxiliary air suction opening and enters the casing from the bottom, then the air can rapidly enter the air channel from the rear air inlet of the volute, the flowing state inside the fan is greatly improved, and the noise problem is further reduced.

Description

Fume exhaust fan

Technical Field

The utility model relates to a kitchen appliance technical field especially relates to a range hood.

Background

The range hood is a kitchen appliance for purifying the kitchen environment. The centrifugal fan is a main component of the range hood and generally comprises a single air inlet fan and a double air inlet fan. The single-side air inlet enables the air inlet of the range hood to suck air unevenly, thereby causing large noise and easily generating turbulent flow, and simultaneously, the effect of large air quantity and large pressure can be realized by a motor with enough large power.

The driving motor of the double-inlet fan is generally fixed on the volute by a bracket, and in order to make the motor and the bracket better fit, the motor with a larger flange surface on the front and rear shells is generally adopted. The flange surfaces of the bracket and the motor can be used as barriers for blocking air inlet at the rear part of the volute, thereby reducing air volume and increasing noise; on the other hand, in order to fix the support conveniently, the manufacturing process of the volute is complex, the labor intensity is high, and the production efficiency is low.

Therefore, the Chinese utility model patent with the application number of CN201520944166.9 (the authorized bulletin number is CN205156092U) discloses a novel range hood, which comprises a range hood shell, a volute arranged in the range hood shell, an impeller embedded in the volute and a motor driving the impeller to rotate, wherein the motor is directly arranged on the range hood shell through a fixing mechanism, namely, the volute and the motor are arranged separately, the motor does not need to be arranged on the volute through a bracket, thereby reducing the influence of the bracket and the front and rear shell flanges of the motor on the blocking of inlet air behind the volute, the vibration force generated when the motor rotates can not be directly transmitted to the volute, the volute is not easy to loosen, the range hood is stable in structure, the inlet air volume of the volute is larger, the oil smoke absorption effect is good, and the generated noise is smaller.

However, the range hood in the above patent still has certain deficiency, and the front part of the motor of the centrifugal fan of the range hood is still located in the rear air inlet of the volute, occupying most of the air inlet area of the rear air inlet, so that the resistance of the front and rear ends of the volute is different, the air inlet is uneven, and large noise and abnormal sound are easily generated. On the other hand, the distance between the rear side air inlet of the volute and the rear plate of the casing in the range hood is too small, and the smoothness of the rear side air inlet of the volute is also affected, so that the difference of the air inlet amount of the front air inlet and the rear air inlet of the volute is large.

Therefore, the existing range hood needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, provide a can effectively improve the range hood of the big and abnormal sound problem of noise that causes because of the front and back both sides air inlet of spiral case is inhomogeneous.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a range hood, comprising:

a housing;

the fan is arranged in the shell and comprises a volute, an impeller and a motor, the volute is provided with a front air inlet, and the impeller is arranged in the volute and is in transmission connection with an output shaft of the motor;

the main body part of the motor is positioned outside the volute and is fixed relative to the shell;

the front side of the machine shell is provided with a main air suction opening opposite to the front air inlet, and the bottom of the machine shell is provided with an auxiliary air suction opening.

In order to realize the transmission connection between the output shaft of the motor and the impeller and ensure the stability in the transmission process, the supporting seat is arranged at the rear air inlet of the volute;

and a rotating shaft which is provided on a central shaft of the impeller and fixed to the impeller, is connected to an output shaft of the motor, and is rotatably supported by the support base.

In order to realize the rotary connection of the rotating shaft and the supporting seat, the supporting seat comprises a rotating shaft connecting part positioned in the middle and connecting supporting arms which are arranged at intervals along the periphery of the rotating shaft connecting part and are integrally distributed in a radial shape, a bearing mounting hole is formed in the rotating shaft connecting part, and a bearing used for being connected with the rotating shaft is arranged on the bearing mounting hole.

In order to further reduce vibration transmission between the impeller and the motor and simplify the consideration of a transmission structure between the motor and the impeller, the volute is also provided with a rear air inlet, the motor is opposite to the rear air inlet of the volute, a straight line where an output shaft of the motor is located is collinear with an axis of the impeller, and the rotating shaft is connected with the output shaft of the motor through an elastic coupling. The flexible connection changes and isolates the 50Hz excitation, frequency multiplication and frequency conversion (vibration transmission path isolation) of the motor, and can be more suitable for the running working condition of the motor with the change of the rotating speed caused by frequent start and stop and the change of back pressure

In order to realize the firm connection of the rotating shaft and the impeller, the impeller comprises a middle disc, and the end part of the rotating shaft is connected with the middle disc through a wheel disc.

In order to ensure the strength of the connection area of the casing and the motor, the casing comprises a rear side plate opposite to a rear air inlet of the volute, a pressing table formed by sinking towards the outside of the casing is arranged on the rear side plate of the casing, and the motor is arranged on the pressing table.

In order to further improve the vibration isolation effect and reduce the transmission of vibration to the shell in the running process of the motor, the rear part of the motor is provided with a connecting support plate, and a vibration isolation pad is arranged between the connecting support plate and the pressing table.

In order to improve the air inlet effect at the rear air inlet of the volute, the casing comprises a rear side plate opposite to the rear air inlet of the volute and a front side plate opposite to the front air inlet of the volute, and the distance between the rear side plate and the rear air inlet of the volute is larger than the distance between the front side plate and the front air inlet of the volute.

The installation position of the volute in the casing needs to be reasonably designed, smooth air inlet of a rear air inlet is guaranteed, and the problem of vibration caused by overlong cantilever of a transmission shaft between a motor and an impeller is avoided, wherein the distance between the rear side plate and the rear air inlet of the volute is marked as L1, the distance between the front side plate and the front air inlet of the volute is marked as L2, and L1/L2 is more than or equal to 2 and less than or equal to 3.

As an improvement, the casing includes with the relative posterior lateral plate in the back air inlet of spiral case, with the relative preceding curb plate in the preceding air inlet of spiral case and connect the posterior lateral plate with the bottom plate of preceding curb plate, main inlet scoop set up on the preceding curb plate, the front portion of bottom plate upwards slopes from the back to the front and forms the hang plate, at least part of supplementary inlet scoop arranges on the hang plate, the front portion of bottom plate is made the slope design, accords with the flow law of flue gas rising process better, reduces the oil smoke escape problem.

The design of the auxiliary air suction opening facilitates the air flow to enter from the rear air inlet of the volute, the flowing state inside the fan can be greatly improved, and the noise problem is reduced.

In order to further reduce the problem of oil smoke escape, a smoke baffle plate capable of opening or closing the main air suction opening is further arranged on the front side plate of the machine shell.

Compared with the prior art, the utility model has the advantages that: because the main part of the motor is positioned outside the volute, the front air inlet or the rear air inlet of the volute cannot be blocked, the problem of uneven air inlet on the front side and the rear side of the volute caused by the fact that the motor occupies the air inlet area of the front air inlet or the rear air inlet in the prior art is effectively solved, and the noise problem of the fan is reduced. On the other hand, the auxiliary air suction opening is formed in the bottom of the casing, so that air can rapidly enter the air channel from the rear air inlet of the volute after entering the casing from the bottom through the auxiliary air suction opening, air inlet resistance is reduced, the flowing state inside the fan is greatly improved, the noise problem is further reduced, and the oil smoke absorption effect is improved.

Drawings

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

fig. 2 is a schematic view of a back three-dimensional structure of a range hood according to an embodiment of the present invention;

fig. 3 is a vertical sectional view of the range hood according to the embodiment of the present invention along the front-back direction;

fig. 4 is an exploded view of the range hood according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

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 present invention, but these terms are used herein for convenience of description only and are determined based on example orientations shown in the drawings. Because the disclosed embodiments may be arranged in different orientations, these directional terms are for illustrative purposes only and should not be construed as limiting, and for example, "upper" and "lower" are not necessarily limited to orientations opposite or consistent with the direction of gravity.

Referring to fig. 1 to 4, a range hood includes a housing 10 and a fan 20 disposed on the housing 10.

The casing 10 of the present embodiment has a square casing structure, and includes a front side plate 12, a rear side plate 11, a bottom plate 14, a top plate 13, and a left side plate 191 and a right side plate 192 on the left and right sides. Wherein, the front side plate 12 is provided with a main air suction opening 15, and the bottom plate 14 is provided with an auxiliary air suction opening 16. Wherein, main inlet scoop 15 department covers has the oil net for filter the oil smoke and improve the flue gas flow state here. The bottom plate 14 has strip-shaped air inlet openings 160 extending in the front-rear direction and arranged side by side in the left-right direction, and the strip-shaped air inlet openings 160 together constitute the auxiliary air inlet opening 16.

Referring to fig. 3, the bottom plate 14 includes an inclined plate 141 inclined upward from the rear to the front and a horizontal plate 142 horizontally extending from the rear side of the inclined plate 141 to the rear. Wherein the strip-shaped air inlet holes 160 of the auxiliary air suction opening 16 are arranged on the inclined plate 141 and the horizontal plate 142. The inclined structure of the bottom plate 14 can better accord with the flow rule of the smoke rising process, and the problem of oil smoke escape is reduced.

The front side plate 12 of the casing 10 is further provided with a smoke baffle 17, the upper side edge of the smoke baffle 17 is hinged on the front side plate 12 of the casing 10, and the smoke baffle 17 has a folding state of being folded on the front side plate 12 of the casing 10 to cover the whole front side plate 12 and an unfolding state of being turned forwards relative to the front side plate 12 to open the main air suction opening 15. Wherein, the turning action of the smoke barrier 17 is driven by a driving mechanism arranged on the casing 10, the driving mechanism can be an electric push rod 18, as shown in fig. 4, the end of the main body of the electric push rod 18 is hinged on the left side plate 191 of the casing 10. The output end of the electric push rod 18 is connected with the inner wall of the smoke baffle 17.

Referring to fig. 3, the fan 20 includes a scroll casing 21, an impeller 22, and a motor 23. The scroll casing 21 has an air outlet 130 and a front air inlet 211 and a rear air inlet 212 respectively located at front and rear sides. The impeller 22 is disposed in the volute casing 21, and the front and rear air inlet ports of the impeller 22 are respectively opposite to the front air inlet 211 and the rear air inlet 212 of the volute casing 21.

Referring to fig. 3, in order to improve the air intake effect at the rear air inlet 212 of the scroll casing 21, the distance between the rear side plate 11 of the housing 10 and the rear air inlet 212 of the scroll casing 21 is greater than the distance between the front side plate 12 and the front air inlet 211 of the scroll casing 21. Specifically, the distance between the rear side plate 11 and the rear air inlet 212 of the volute casing 21 is denoted as L1, and the distance between the front side plate 12 and the front air inlet 211 of the volute casing 21 is denoted as L2, wherein L1/L2 is not less than 2 and not more than 3.

A relatively large distance is provided between the rear side plate 11 of the housing 10 and the rear air inlet 212 of the scroll casing 21, on one hand, to provide a space for accommodating the motor 23, so as to prevent the motor 23 from being too close to the rear air inlet 212 of the scroll casing 21, which would affect the smoothness of the rear air inlet of the scroll casing 21.

The motor 23 of this embodiment is disposed on the side opposite to the rear air inlet 212 of the volute 21, specifically, the straight line where the output shaft of the motor 23 is located is collinear with the axis of the impeller 22, and is in transmission connection with the impeller 22, so as to drive the impeller 22 to rotate, and provide the negative pressure for sucking and exhausting the oil smoke. During the operation of the fan 20, the external air flow may enter the casing 10 through the main air suction opening 15 and the auxiliary air suction opening 16, then enter the volute 21 through the front air inlet 211 and the rear air inlet 212 of the volute 21, and be discharged through the air outlet 130 under the guiding action of the air duct inside the volute 21.

The impeller 22 includes two end disks 224, a center disk 221, a disk 222, and blades. The two end disks 224 are arranged at intervals in the front-rear direction, and the blades are provided between the two end disks 224 and are sequentially distributed at intervals in the circumferential direction of the end disks 224. The outer periphery of the middle disc 221 is distributed with slots (not shown) for the blades to pass through. The disk 222 is attached to a middle region of the middle disk 221 for coupling with a spindle 40 (described below).

Referring to fig. 2 and 3, the motor 23 is fixedly connected to the rear side plate 11 of the housing 10. The rear part of the main body part of the motor 23 is provided with four connecting support plates 231, the connecting support plates 231 are connected on a pressing platform 111 of the rear side plate 11 of the machine shell 10 through screws, wherein the pressing platform 111 is formed by that the part of the rear side plate 11 of the machine shell 10, which is right opposite to the motor 23, is sunken towards the outside of the machine shell to form a first pressing boss structure, the pressing boss is further provided with four second pressing boss structures 1110 formed by reversely (towards the inside of the machine shell 10) in a sunken mode, the four second pressing boss structures 1110 are connected with the four connecting support plates 231 of the motor 23 through screws, and vibration isolation pads 42 are arranged between the four second pressing boss structures 1110 and the four connecting support plates 231 of the motor 23, so that the vibration transmission of the motor 23 to the machine shell 10 in the operation process is reduced.

The output shaft of the motor 23 is connected to the center plate 221 of the impeller 22 through the rotating shaft 40.

Referring to fig. 4, in order to avoid the problem that the rotating shaft 40 greatly shakes during the rotation process driven by the motor 23, the rear air inlet 212 of the volute casing 21 is provided with a supporting seat 30, and each supporting seat 30 comprises a connecting portion 31 of the rotating shaft 40 which is located in the middle and annular, and connecting support arms 32 which are arranged along the periphery of the connecting portion 31 of the rotating shaft 40 at intervals and radially distributed integrally. Each connecting arm 32 in this embodiment is angled forward from inside to outside to reduce the flow resistance at the rear inlet 212 of the volute 21.

The middle part of the connecting part 31 of the rotating shaft 40 is provided with a bearing mounting hole, and a bearing 33 is arranged on the bearing mounting hole. The rotating shaft 40 is inserted into the bearing 33 of the connecting portion 31 of the rotating shaft 40. In order to further reduce the vibration transmission between the impeller 22 and the motor 23 and reduce the resonance and noise of the impeller 22 and the volute 21, the outer end of the rotating shaft 40 is connected with the output shaft of the motor 23 through the elastic coupling 41. The elastic coupling 41 is adopted to change and isolate excitation, frequency multiplication and frequency conversion (vibration transmission path isolation) of the motor 2350Hz, and can be more suitable for the running working condition of the motor 23 with the change of the rotating speed caused by frequent start and stop and backpressure change. Meanwhile, the connection mode can better protect (avoid the impact of the load change of the motor 23 and the start-stop load change caused by the back pressure change of the flue) the motor 23, the impeller 22 and other parts.

Because the main body part of the motor 23 is positioned outside the volute casing 21, the front air inlet 211 or the rear air inlet 212 of the volute casing 21 can not be blocked, the problem of uneven air inlet on the front side and the rear side of the volute casing 21 caused by the fact that the motor 23 occupies the air inlet area of the front air inlet 211 or the rear air inlet 212 in the prior art is effectively solved, and the problem of abnormal sound of the fan 20 is reduced. In a preferred embodiment, the auxiliary air suction opening 16 is disposed at the bottom of the casing 10, so that the air flow enters the casing 10 from the bottom through the auxiliary air suction opening 16, and then can rapidly enter the air duct from the rear air inlet 212 of the volute 21, thereby greatly improving the flow state inside the fan 20 and further reducing the noise problem.

Because the main body part of the motor 23 is positioned outside the volute casing 21, the front air inlet 211 or the rear air inlet 212 of the volute casing 21 cannot be blocked, the problem of uneven air inlet on the front side and the rear side of the volute casing 21 caused by the fact that the motor 23 occupies the air inlet area of the front air inlet 211 or the rear air inlet 212 in the prior art is effectively solved, and the problem of abnormal sound of the fan 20 is reduced. In a preferred embodiment, the auxiliary air suction opening 16 is disposed at the bottom of the casing 10, so that the air flow enters the casing 10 from the bottom through the auxiliary air suction opening 16, and then can rapidly enter the air duct from the rear air inlet 212 of the volute 21, thereby greatly improving the flow state inside the fan 20 and further reducing the noise problem. The use of front side air intake and bottom air intake can effectively promote the oil absorption cigarette effect of complete machine under big or small oil smoke condition (under the different gears that use), satisfies different culinary art environments, enjoys the experience of low noise high-quality. The motor 23 of the embodiment can adopt the thin motor 23 and the thin volute casing 21 (with the thickness of 100-.

The utility model discloses the "transmission is connected" indicates that directly link to each other or link to each other indirectly through drive mechanism between two parts.

Claims

1. A range hood, comprising:

a housing (10);

the fan (20) is arranged in the casing (10) and comprises a volute (21), an impeller (22) and a motor (23), the volute (21) is provided with a front air inlet (211), and the impeller (22) is arranged in the volute (21) and is in transmission connection with an output shaft of the motor (23);

the method is characterized in that: the main body part of the motor (23) is positioned outside the volute (21) and is fixed relative to the machine shell (10);

the front side of the machine shell (10) is provided with a main air suction opening (15) opposite to the front air inlet (211), and the bottom of the machine shell (10) is provided with an auxiliary air suction opening (16).

2. The range hood of claim 1, further comprising:

the supporting seat (30) is arranged at a rear air inlet (212) of the volute (21);

and a rotating shaft (40) which is provided on the central axis of the impeller (22) and fixed to the impeller (22), wherein the rotating shaft (40) is connected to the output shaft of the motor (23) and rotatably supported by the support base (30).

3. The range hood of claim 2, wherein: the supporting seat (30) comprises a rotating shaft connecting portion (31) located in the middle and connecting supporting arms (32) which are arranged at intervals along the periphery of the rotating shaft connecting portion (31) and are distributed radially integrally, a bearing mounting hole is formed in the rotating shaft connecting portion (31), and a bearing (33) used for being connected with the rotating shaft (40) is arranged on the bearing mounting hole.

4. The range hood of claim 2, wherein: the volute (21) is further provided with a rear air inlet (212), the motor (23) is opposite to the rear air inlet (212) of the volute (21), the straight line where the output shaft of the motor (23) is located is collinear with the axis of the impeller (22), and the rotating shaft (40) is connected with the output shaft of the motor (23) through an elastic coupling (41).

5. The range hood of claim 2, wherein: the impeller (22) comprises a middle disc (221), and the end part of the rotating shaft (40) is connected with the middle disc (221) through a wheel disc (222).

6. The range hood according to any one of claims 1 to 5, wherein: the casing (10) comprises a rear side plate (11) opposite to a rear air inlet (212) of the volute (21), a pressing table (111) formed by sinking towards the outside of the casing is arranged on the rear side plate (11) of the casing (10), and the motor (23) is arranged on the pressing table (111).

7. The range hood of claim 6, wherein: the rear part of the motor (23) is provided with a connecting support plate (231), and a vibration isolating pad (42) is arranged between the connecting support plate (231) and the pressing platform.

8. The range hood according to any one of claims 1 to 5, wherein: the machine shell (10) comprises a rear side plate (11) opposite to a rear air inlet (212) of the volute (21) and a front side plate (12) opposite to a front air inlet (211) of the volute (21), and the distance between the rear side plate (11) and the rear air inlet (212) of the volute (21) is larger than the distance between the front side plate (12) and the front air inlet (211) of the volute (21).

9. The range hood of claim 8, wherein: the distance between the rear side plate (11) and a rear air inlet (212) of the volute (21) is marked as L1, the distance between the front side plate (12) and a front air inlet (211) of the volute (21) is marked as L2, wherein L1/L2 is more than or equal to 2 and less than or equal to 3.

10. The range hood according to any one of claims 1 to 5, wherein: casing (10) include with back curb plate (11) relative in back wind gap (212) of spiral case (21), with preceding curb plate (12) relative in the preceding wind gap (211) of spiral case (21) and connect back curb plate (11) with bottom plate (14) of preceding curb plate (12), main inlet scoop (15) set up on preceding curb plate (12), the front portion of bottom plate is from back forward tilt up and is formed hang plate (141), at least local arrangement of supplementary inlet scoop (16) is in on hang plate (141).

11. The range hood of claim 10, wherein: a smoke baffle plate (17) capable of opening or closing the main air suction opening (15) is further arranged on the front side plate (12) of the machine shell (10).