CN212003716U

CN212003716U - Impeller of centrifugal fan and range hood with same

Info

Publication number: CN212003716U
Application number: CN202020221429.4U
Authority: CN
Inventors: 宁国立
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-11-24
Anticipated expiration: 2030-02-27

Abstract

The utility model discloses a centrifugal fan's impeller, well dish between preceding dish and back dish is set up including preceding dish, back dish, interval, the impeller is still including setting up between preceding dish and the back dish, well dish week portion's blade, its characterized in that: through holes are formed in the inner sides of the blades and on the middle disc, and guide vanes which are in a flanging shape and extend towards the direction of the front disc are formed on one side of the circumferential direction of the through holes. Also discloses a range hood applying the impeller. Compared with the prior art, the utility model has the advantages of: the air quantity of the impeller can be increased and the operation noise can be reduced without changing the whole size of the impeller and increasing materials.

Description

Impeller of centrifugal fan and range hood with same

Technical Field

The utility model relates to an oil smoke purifier, especially a centrifugal fan's impeller and applied range hood that has this impeller.

Background

The multi-wing centrifugal fan is the main power system of cooking fume exhauster and other ventilation equipment, and has the features of compact structure, low noise, high pressure coefficient, great flow coefficient, etc.

For example, the chinese patent application No. 201810089833.8 discloses a range hood, which comprises a fan, wherein the fan comprises a motor, an impeller and a clean core ring, and the impeller and the clean core ring are respectively and sequentially mounted on a motor shaft of the motor in parallel, so that the impeller and the clean core ring are in a split structure.

At present, common methods for increasing the air volume of a centrifugal fan without increasing noise are divided into an increasing method and a reducing method, wherein the increasing method is to increase the rotating diameter of an impeller and lengthen blades, but the method is limited by the size, the manufacturing difficulty is correspondingly increased after the increasing, and the dynamic balance of the increased impeller in rotation is also poor; the reduction method is to reduce the diameter and length of the impeller, increase the rotation speed, shift the noise to the low frequency band, and then use the sound-absorbing material capable of reducing the low frequency band to absorb the sound, but the cost of the sound-absorbing material in the method is high, and the sound-absorbing material is easy to be polluted to reduce the sound-absorbing effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is not enough to above-mentioned prior art, provides one kind and can not change the whole size of impeller, not increase the material, just can increase the centrifugal fan's of amount of wind and noise reduction impeller.

The utility model aims to solve the second technical problem that a range hood that has this impeller of application is provided.

The utility model provides a first technical scheme that above-mentioned technical problem adopted does: the utility model provides an impeller of centrifugal fan, includes that preceding dish, after-disc, interval set up the well dish between preceding dish and after-disc, the impeller is still including setting up between preceding dish and the after-disc, well dish week portion's blade, its characterized in that: through holes are formed in the inner sides of the blades and on the middle disc, and guide vanes which are in a flanging shape and extend towards the direction of the front disc are formed on one side of the circumferential direction of the through holes.

In order to confirm the turn-ups position of stator on the through-hole on the rotation path of impeller, the through-hole is located the upstream of stator, one side that the through-hole was kept away from to the stator is formed with relative stator first end and stator second end on the projection on the back dish, stator first end is located the radial outside of center sill for stator second end on the rotation path of impeller, the stator first end of stator is located the upstream of stator second end.

In order to determine the inclination angle of the guide vane, the guide vane is a straight blade, a connecting line between the first end of the guide vane and the center of the middle disc of the guide vane is L1, a connecting line between the first end of the guide vane and the second end of the guide vane is L2, an included angle between L1 and L2 is theta 1, and the theta 1 is greater than an inlet angle of the blade and less than 60 degrees.

In order to make the flanging angle of the guide vane, the included angle between the guide vane and the through hole ranges from 15 degrees to 90 degrees.

In order to determine the number of vanes, the number of vanes does not exceed half the number of blades.

In order to determine the arc shape of the guide vane, the guide vane is an arc blade, the first end and the second end of the guide vane are arc-shaped, the central angle is theta 2, and theta 2 is not more than 60 degrees.

In order to ensure the main air inlet area on the front side of the impeller and ensure better dynamic balance of the impeller, the middle part of the middle disc is provided with a boss which is sunken towards the front disc and is in a round table shape, the boss comprises a boss first end part close to the front disc, a boss second end part close to the rear disc and a boss side part which is connected with the peripheral parts of the boss first end part and the boss second end part, and the through hole and the guide vane are arranged on the boss side part.

In order to determine the length of the guide vane, the distance between one end of the guide vane close to the first end part of the boss and the first end part of the boss ranges from 3mm to 5mm, and the distance between one end of the guide vane close to the second end part of the boss and the second end part of the boss ranges from 3mm to 5 mm.

In order to ensure the strength, the distance between the periphery of the boss close to the rear disk and the end part of the blade close to the boss is more than 5 mm.

The utility model provides a second technical scheme that above-mentioned technical problem adopted does: a range hood, its characterized in that: comprises an impeller of the centrifugal fan.

Compared with the prior art, the utility model has the advantages of: through set up the through-hole on the center sill after, be formed with turn-ups form, the stator that extends towards the front disk direction on one side of through-hole circumference, the rethread sets up gradient, turn-ups height, turn-ups angle, length and the number of stator to can not change the overall dimension of impeller, increase the material, just can increase the amount of wind and the reduction noise of impeller.

Drawings

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

fig. 2 is a schematic view of an impeller according to a first embodiment of the present invention;

fig. 3 is a front schematic view of a center plate of an impeller according to a first embodiment of the present invention;

fig. 4 is a projection of a guide vane of an impeller according to a first embodiment of the present invention on a rear disc;

fig. 5 is a schematic side view of a center plate of an impeller according to a first embodiment of the present invention;

fig. 6 is a schematic front view of a center plate of an impeller according to a second embodiment of the present invention;

fig. 7 is a side view of the center plate of the impeller according to the second embodiment of the present invention;

fig. 8 is a projection of a guide vane of an impeller according to the second embodiment of the present invention on a rear disk.

Detailed Description

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

Example one

Referring to fig. 1, a range hood includes a smoke collecting hood 100 and a fan frame 200 disposed above the smoke collecting hood 100, wherein a fan system (not shown) is disposed in the fan frame 200, and in this embodiment, the fan system is a centrifugal fan. Referring to fig. 2, the impeller of the centrifugal fan is shown. The impeller comprises a front disk 1, a rear disk 2, a middle disk 3 arranged between the front disk 1 and the rear disk 2 at intervals, and blades 4 arranged between the front disk 1 and the rear disk 2 and on the periphery of the middle disk 3, thereby forming the double-air-inlet centrifugal fan. The above structure is the same as the prior art.

Referring to fig. 3, a through hole 31 is formed in the inner side of the blade 4 on the inner disk 3, and a guide vane 32 in a flanging shape and extending toward the front disk 1 is formed on one circumferential side of the through hole 31. The through hole 31 is a rectangular hole, and the guide vane 32 is a straight blade. In the present embodiment, the guide vane 32 is formed by opening the through hole 31 and folding the material at the position of the original through hole 31, so that no additional material is required to be added. Alternatively, the guide vane 32 may be disposed on the through hole 31 by welding or bonding. The height of the through hole 31 in the circumferential direction is greater than that of the guide vane 32, before the guide vane 32 is not turned over, the minimum gap between the end part of the guide vane to be turned over and the edge of the through hole 31 is guaranteed to be 2-3 times of material thickness, if the middle disc 3 is a plate with the thickness of 1mm, the height of the guide vane 32 is 10mm, and the height of the through hole 31 in the circumferential direction is more than 12 mm.

Referring to fig. 4, in the rotation path of the impeller, the through hole 31 is located upstream of the guide vane 32, and a side of the guide vane 32 away from the through hole 31 is formed with a guide vane first end 321 and a guide vane second end 322 opposite to each other in projection on the rear disk 2. The guide vane first end 321 is located radially outside the center disk 2 with respect to the guide vane second end 322, and the guide vane first end 321 of the guide vane 32 is located upstream of the guide vane second end 322 on the rotational path of the impeller.

The guide vane 32 is a straight vane, a connecting line between a first guide vane end 321 of the guide vane 32 and the center of the middle disc 3 is L1, a connecting line between the first guide vane end 321 of the guide vane 32 and a second guide vane end 322 of the guide vane is L2, an included angle between L1 and L2 is theta 1, and the theta 1 is larger than an inlet angle of the vane 4 and smaller than 60 degrees, and the preferred range is 30 degrees +/-10 degrees.

The range of the included angle between the guide vane 32 and the through hole 31 is 15-90 degrees, preferably 45-60 degrees, the inclination direction of the guide vane 32 is consistent with the rotation direction of the impeller, and the flow resistance is small. The number of the vanes 32 is not more than half of the number of the blades 4, and if the number of the blades 4 is 60 in the present embodiment, the number of the vanes 32 is at most 30. The number of the guide vanes 32 is 6 or more, and preferably in the range of 10 to 20.

The smaller the height of the guide vane 32 is, the smaller the resistance and the guiding function are, the main rotating speed of an alternating current motor for driving an impeller of the fan system is in the range of 800rpm-1200rpm, the preferable height range is 5mm-15mm, and the higher the rotating speed is, the smaller the height of the guide vane 32 is; if the fan system adopts a direct current motor, the rotating speed of the direct current motor is within the range of 1300 plus 1500rpm, and the preferred height range is 5mm-10 mm. The smaller the included angle between the guide vane 32 and the through hole 31 is, the larger the turnup height of the guide vane 32 can be within the preferred range, and the smaller the included angle between the guide vane 32 and the through hole 31 is 90 degrees, for example, when the main rotating speed of the alternating current motor is within the range of 800rpm to 1200rpm, the included angle between the guide vane 32 and the through hole 31 is 90 degrees, the height of the guide vane 32 is preferably 5mm, and when the included angle between the guide vane 32 and the through hole 31 is 30 degrees (the preferred range of the included angle is 15 degrees to 90 degrees), the height of the guide vane 32 is preferably 15 mm.

Referring to fig. 5, a boss 33 in a truncated cone shape recessed toward the front disk 1 is formed at the middle of the middle disk 3. The boss 33 includes a boss first end 331 near the front disk 1, a boss second end 332 near the rear disk 2, and a boss side 333 connecting peripheries of the boss first end 331 and the boss second end 332, and the through hole 31 and the guide vane 32 are provided on the boss side 333.

The radius of the first end 331 of the boss is slightly larger than the radius of the impeller motor, and is generally larger than about 5 mm. To ensure strength, the perimeter of the boss second end 332 is more than 5mm from the end of the vane 32 near the boss 33.

In order to determine the overall length of the vane 32, and from the viewpoint of overall strength and machinability of the vane 32, the distance between one end of the vane 32 near the boss first end 331 and the boss first end 331 is 3mm to 5mm, and the distance between one end of the vane 32 near the boss second end 332 and the boss second end 332 is 3mm to 5 mm.

The guide vanes 32 may also be welded or bonded directly to the center disk 3, but this method increases the weight of the center disk 3 and the blades 4 have a poor rotational distribution.

Example two

Referring to fig. 6 to 7, the present embodiment is different from the first embodiment in that: the guide vane 32 is an arc blade (the guide vane 32 is arc-shaped in the radial direction of the central disc 3, both side edges of the through hole 31 in the circumferential direction are arc-shaped extending along the radial direction of the central disc 3, and the projection of the guide vane 32 on the front disc 1 or the rear disc 2 is also arc-shaped), and the arc-shaped guide vane 32 can change the air flow angle at the outlet of the guide vane 32.

In order to ensure strength, the first end 321 of the guide vane 32 is spaced from the periphery of the second end 332 of the boss 33 by 3mm or more, and the second end 322 of the guide vane is spaced from the periphery of the first end 331 of the boss by 3mm or more.

Referring to fig. 8, the guide vane 32 has a circular arc shape between the guide vane first end 321 and the guide vane second end 322, and the central angle is θ 2, and the inlet angle θ 2 of the vane 4 is not less than θ 2 and not more than 60 °, preferably 30 ° to 45 °.

If the rotating speed of the impeller is too high, the angle of the guide vane 32 needs to be adjusted, at this time, the guide vane 32 is rotated counterclockwise by a certain angle around the guide vane second end 322, the maximum rotating angle is less than +5 degrees of the inlet angle of the blade 4, and the rotating angle is increased in a high-rotating-speed scene of the impeller and reduced in a low-rotating-speed scene of the impeller.

Claims

1. The utility model provides an impeller of centrifugal fan, includes preceding dish (1), after-disc (2), interval setting well dish (3) between preceding dish (1) and after-disc (2), the impeller still includes blade (4) that set up between preceding dish (1) and after-disc (2), well dish (3) week portion, its characterized in that: through-hole (31) have been seted up to the inboard on well dish (3), blade (4), through-hole (31) circumference one side is formed with turn-ups form, towards stator (32) that preceding dish (1) direction extends.

2. The impeller of claim 1, wherein: on the rotational path of impeller, through-hole (31) are located the upstream of stator (32), one side that middle dish (3) was kept away from to stator (32) is formed with relative stator first end (321) and stator second end (322) on the projection on back dish (2), stator first end (321) are located the radial outside of middle dish (3) for stator second end (322), on the rotational path of impeller, stator first end (321) of stator (32) are located the upstream of stator second end (322).

3. The impeller of claim 2, wherein: the stator (32) is straight blade, the line between stator first end (321) of stator (32), well dish (3) center is L1, and the line between stator first end (321) of stator (32), stator second end (322) is L2, and the contained angle of L1 and L2 is theta 1, and theta 1 is greater than the inlet angle of blade (4), is less than 60 degrees.

4. The impeller of claim 3, wherein: the range of the included angle between the guide vane (32) and the through hole (31) is 15-90 degrees.

5. The impeller of claim 3, wherein: the number of guide vanes (32) does not exceed half the number of blades (4).

6. The impeller of claim 2, wherein: the stator (32) is a circular arc blade, a circular arc shape is formed between a stator first end (321) and a stator second end (322) of the stator (32), and a central angle is theta 2 which is not less than 60 degrees.

7. The impeller according to any one of claims 1 to 6, wherein: the middle part of the middle disc (3) is provided with a boss (33) which is concave towards the direction of the front disc (1) and is in a round table shape, the boss (33) comprises a boss first end part (331) close to the front disc (1), a boss second end part (332) close to the rear disc (2) and a boss side part (333) which is connected with the peripheral parts of the boss first end part (331) and the boss second end part (332), and the through hole (31) and the guide vane (32) are arranged on the boss side part (333).

8. The impeller of claim 7, wherein: the distance between one end of the guide vane (32) close to the boss first end portion (331) and the boss first end portion (331) is 3 mm-5 mm, and the distance between one end of the guide vane (32) close to the boss second end portion (332) and the boss second end portion (332) is 3 mm-5 mm.

9. The impeller of claim 7, wherein: the distance between the periphery of the boss (33) close to the rear disc (2) and the end of the blade (4) close to the boss (33) is larger than 5 mm.

10. A range hood, its characterized in that: impeller comprising a centrifugal fan according to any one of claims 1 to 9.