CN212376959U - Volute of centrifugal fan - Google Patents
Volute of centrifugal fan Download PDFInfo
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- CN212376959U CN212376959U CN202020713042.0U CN202020713042U CN212376959U CN 212376959 U CN212376959 U CN 212376959U CN 202020713042 U CN202020713042 U CN 202020713042U CN 212376959 U CN212376959 U CN 212376959U
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Abstract
The utility model relates to a centrifugal fan's spiral case, including having the appearance chamber that is used for the holding impeller, the bottom of spiral case seted up with hold the oil leak hole that the chamber is linked together, its characterized in that: the oil leakage device is embedded in the oil leakage hole, the oil leakage part is locally positioned in the cavity, and an oil guide channel communicated with the cavity and the outside is arranged in the oil leakage part. Compared with the prior art, the utility model has the advantages of: the oil leakage part is positioned in the volute and can reduce the air flow speed at the oil leakage hole, so that the pressure at the oil leakage hole is reduced, the dynamic pressure loss at the oil leakage hole in the volute is reduced, the leakage amount of the smoke at the oil leakage hole is reduced, and the noise is reduced; the existence of the oil guide channel in the oil leakage part avoids the direct communication between the volute cavity and the outside of the volute, reduces the leakage of the smoke at the oil leakage hole and improves the smoke exhaust efficiency.
Description
Technical Field
The utility model belongs to the technical field of range hood, concretely relates to centrifugal fan's spiral case for range hood.
Background
When the range hood is started to operate, one part of oil smoke generated by cooking is blocked outside the volute by the filter screen, the other part of the oil smoke enters the volute and is thrown on the inner wall of the volute under the action of centrifugal force of the rotating impeller, and a small part of the oil smoke enters the flue along with gas.
When the fan operates, the impeller in the volute applies work to the gas, the flow velocity of the gas is increased, and the pressure in the volute is increased. Under the action of the pressure difference between the inside and the outside of the volute, the gas in the volute is ejected from the oil leakage hole at a certain speed. The larger the pressure in the volute is, the higher the speed is, the more violent the shearing force drives the peripheral air to move, the falling and whirling generated by the action can generate falling noise, and if the ejected gas impacts the inner wall of the box body of the range hood, impact noise can be generated.
Therefore, like the chinese utility model patent "a lampblack absorber spiral case with function of making an uproar falls", its patent number is ZL201621209245.6 (the publication number is CN206352848U) discloses a lampblack absorber spiral case with function of making an uproar falls, including the spiral case, the spiral case in be equipped with the air runner, spiral case bottom be equipped with the communicating oil leak hole of air runner, spiral case bottom just be located oil leak hole department protrusion and be provided with the oil leak mouth. The oil leakage nozzle is arranged at the bottom of the volute and at the oil leakage hole in a protruding mode and can cover the oil leakage hole, the air flow channel is prevented from being directly communicated with the outer side of the volute, the leakage amount of smoke from the oil leakage hole is reduced, noise generated at the oil leakage hole is reduced, and smoke exhaust efficiency is improved.
However, the above volute has the following drawbacks: when the operating pressure of the fan is increased, the static pressure value at an oil leakage hole in the volute is increased, so that the leakage amount of smoke and kitchen noise are increased; when the range hood operates, the operating pressure of the fan is increased due to the resistance of the common flue, and the jet flow noise at the oil leakage hole in the volute is increased.
Accordingly, further improvements to existing fan volutes are desired.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the current situation of above-mentioned prior art, provide a reduce the spiral case of the inside oil leak hole department of spiral case dynamic pressure loss and gas leakage in order to reach the centrifugal fan who falls the purpose of making an uproar.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a centrifugal fan's spiral case, is including having the appearance chamber that is used for the holding impeller, the bottom of spiral case seted up with the oil leak hole that the appearance chamber is linked together, its characterized in that: the oil leakage device is embedded in the oil leakage hole, the oil leakage part is locally positioned in the cavity, and an oil guide channel communicated with the cavity and the outside is arranged in the oil leakage part.
The oil leakage part has multiple structural forms, can only comprise a main body part positioned in the containing cavity, can also be locally positioned outside the containing cavity, but preferably comprises a main body part positioned in the containing cavity and a flow guide part positioned outside the containing cavity, wherein the flow guide part is positioned below the main body part and communicated with the main body part to form the oil guide channel, the main body part is provided with an inlet communicated with the oil guide channel, and the flow guide part is provided with an outlet communicated with the oil guide channel.
In order to reduce the pressure difference resistance at the oil leakage hole, the head end of the main body part is smooth and the tail end of the main body part is sharp along the airflow flowing direction in the containing cavity. Therefore, the effects of reducing the impact loss and gas leakage in the volute are achieved.
In order to reduce the flow loss, at least one of the two opposite side walls of the main body part in the direction perpendicular to the airflow direction is provided with the inlet. In this way, aerodynamic performance losses of the bypass flow are facilitated to be reduced and grease slipping is facilitated.
Preferably, the main body portion has an elongation ratio l/t, t is a maximum dimension of the main body portion in a direction perpendicular to the flow direction of the airflow, the direction perpendicular to the flow direction of the airflow substantially coincides with the axial direction of the volute, the elongation ratio l/t is 4.1, the cross sections of the head end and the tail end of the main body portion are both semi-elliptical, and the profile of the cross section of the main body portion satisfies:
Y(x)＝-0.004x4+0.0809x3-0.6003x2+2.2433x+0.02 (0≤x≤8)；
Y(x)＝7e-0.5x3-0.0111x2+0.2836x+2.9995 (8≤x≤41)。
in order to reduce gas leakage, a transversely extending diaphragm is disposed inside the flow guide portion, and a gap is left between the diaphragm and at least one side wall of the flow guide portion, and the gap is in fluid communication with the inlet and the outlet. Thus, the design of the diaphragm plate can generate vortex loss, so that the gas pressure is reduced to achieve the purpose of reducing gas leakage.
In order to further achieve the purpose of reducing gas leakage, the diaphragm plates are at least two and are arranged in a vertically staggered and spaced mode. Like this, the runner between the adjacent diaphragm is like labyrinth design, when gas passes through labyrinth runner, can produce great vortex and resistance, then produces strong swirl loss for gas pressure reduces gradually.
In order to reduce noise, the lower surface of the diaphragm is provided with at least two vertical plates which are arranged at intervals in the vertical airflow flowing direction, the vertical plates extend downwards, and a noise reduction unit is formed between every two adjacent vertical plates. The existence of the silencing unit can enable sound waves in a certain frequency range to interfere and attenuate with each other, reduce noise and further achieve the silencing effect.
In order to reduce noise, the tail ends of two adjacent vertical plates extend oppositely to form extension parts, and a gap is reserved between the extension parts of the two adjacent vertical plates to form a silencing hole.
In order to reduce noise, the resonance frequency f of the sound attenuation unit satisfies:
c is gas velocity, S ═ l b is cross-sectional area of the muffling hole, l is upper and lower length of the muffling hole, b is muffling holeV is the volume of the silencing unit, and the width b of the silencing hole on the diaphragm is gradually increased along the airflow flow path. Because the resonance response with specific noise frequency occurs when the noise reduction unit is interfered by external noise, the resonance characteristic can be used for attenuating noise energy, thereby having good noise reduction effect.
The oil leakage piece and the oil leakage hole are connected in various manners, but preferably, the oil leakage hole is rectangular, the long edge of the rectangle extends along the flowing direction of the airflow in the accommodating cavity, the periphery of the oil leakage hole is bent downwards to form a step part, and an insertion groove for partially inserting the step part of the oil leakage hole is formed in the peripheral wall of the oil leakage piece.
Compared with the prior art, the utility model has the advantages of: the oil leakage part is positioned in the volute and can reduce the air flow speed at the oil leakage hole, so that the pressure at the oil leakage hole is reduced, the pressure loss at the oil leakage hole in the volute is reduced, the leakage amount of the smoke at the oil leakage hole is reduced, and the noise is reduced; the existence of the oil guide channel in the oil leakage part avoids the direct communication between the volute cavity and the outside of the volute, reduces the leakage of the smoke at the oil leakage hole and improves the smoke exhaust efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a schematic diagram of the volute of FIG. 1;
FIG. 5 is a schematic view of a structure of an oil leaking member;
FIG. 6 is a cross-sectional view of FIG. 5;
FIG. 7 is a schematic view of a profile of a body portion;
FIG. 8 is a cloud of the speed of the centrifugal fan according to the first embodiment;
fig. 9 is a sectional view of the oil drain of the second embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The first embodiment is as follows:
as shown in fig. 1 to 8, it is a first preferred embodiment of the present invention.
The centrifugal fan of the present embodiment is generally disposed in the casing of the range hood. The centrifugal fan comprises a volute 1, an impeller 4 and a motor 5 used for driving the impeller 4 to rotate around the axis of the volute 4, wherein the volute 1 is provided with a containing cavity 1a used for containing the impeller 4, the volute 1 comprises a front cover 15 and a rear cover 16 which are parallel to each other and a ring wall 17 connected between the front cover 15 and the rear cover 16, an air inlet 1b communicated with the containing cavity 1a is formed in the center of the front cover 15, and an air outlet 1c communicated with the containing cavity 1a is formed in the top of the volute 1.
The bottom of the volute 1 of this embodiment is provided with an oil leakage hole 11 communicated with the accommodating cavity 1a, an oil leakage member 2 is embedded in the oil leakage hole 11 of the volute, the oil leakage member 2 is a rubber member, the oil leakage member 2 is locally located in the accommodating cavity 1a, and an oil guide passage 2a communicating the accommodating cavity 1a with the outside is arranged inside the oil leakage member 2. Specifically, as shown in fig. 4, the oil leakage hole 11 is rectangular, a long side of the rectangle extends along the airflow flowing direction in the cavity 1a, a short side of the rectangle extends along the airflow flowing direction, a circumference of the oil leakage hole 11 is bent downward and extends inward to form a step portion 111, an insertion groove 23 is formed in the outer circumferential wall of the oil leakage member 2, into which the step portion 111 of the oil leakage hole 11 is partially inserted, the oil leakage member 2 is embedded in the oil leakage hole 11 through the insertion and engagement of the step portion 111 and the insertion groove 23, and when the oil leakage member 2 is installed in the oil leakage hole 11, a top surface of an upper plate of the insertion groove 23 is flush with a bottom wall of the volute adjacent to the oil leakage hole, as shown in fig. 3. The air flow direction refers to the direction indicated by the hollow arrow a in fig. 2 and 4, and the vertical air flow direction refers to the direction indicated by the hollow arrow B in fig. 3, and the vertical air flow direction is substantially consistent with the axial direction of the volute 1, and the axial direction of the volute 1 is the axial direction of the impeller 4.
As shown in fig. 1 to 7, the oil leaking member 2 includes a main body portion 21 located in the cavity 1a and a flow guiding portion 22 located outside the cavity 1a, the flow guiding portion 22 is located below the main body portion 21 and is communicated with the main body portion 21 to form the oil guiding channel 2a, the main body portion 21 is provided with an inlet 211 communicated with the oil guiding channel 2a, and the inlet 211 has a shape of a circular arcIn the body, the main body 21 has two opposite side walls perpendicular to the airflow flowing direction, and the inlet 211 is disposed on a plane substantially parallel to the front cover 15, the inlet 211 is rectangular, the length of the long side of the inlet 211 is 20mm, and the length of the short side of the inlet 211 is 5 mm. As shown in fig. 2 and 5, along the airflow flowing direction in the cavity 1a, the head end 21a of the main body 21 is rounded and the tail end 21b is sharp, the slenderness ratio of the main body 21 is l/t, t is the maximum dimension of the main body 21 in the direction perpendicular to the airflow flowing direction, the slenderness ratio l/t is 4.1, the cross sections of the head end 21a and the tail end 21b of the main body 21 are both semi-elliptical, and as shown in fig. 7, the profile of the cross section of the main body 21 (i.e., the peripheral edge of the top surface of the main body 21) satisfies: yx-0.004 x4+0.0809x3-0.6003x2+2.2433x+0.02 0≤x≤8；Yx＝7e-0.5x3-0.0111x2+0.2836x+2.9995 8≤x≤41。
As shown in fig. 6, a transverse partition plate 3 extending transversely is disposed inside the flow guide portion 22, a gap 3a is left between the transverse partition plate 3 and at least one side wall of the flow guide portion 22, at least two transverse partition plates 3 are provided, in this embodiment, as shown in fig. 3, three transverse partition plates 3 are arranged in a vertically staggered and spaced manner, a lower surface of each transverse partition plate 3 is provided with at least two vertical plates 31 arranged in a spaced manner in a direction perpendicular to the flow direction of the airflow, the vertical plates 31 extend downward, and the gap 3a is in fluid communication with the inlet 211 and the outlet 223. In addition, as shown in fig. 6, a sound deadening unit 31a is formed between two adjacent vertical plates 31, and a sound deadening unit 31a is also formed between a vertical plate provided adjacent to the vertical inner wall plate of the housing and the vertical inner wall plate. The bottom of the flow guide part 22 is provided with an outlet 223 communicated with the oil guide channel 2a, and the outlet 223 is positioned below the diaphragm plate 3.
The oil leaking part 2 is partially located in the volute 1, and can reduce the air flow velocity at the oil leaking hole 11, so that the pressure at the oil leaking hole is reduced, the pressure loss at the oil leaking hole 11 inside the volute 1 is reduced, the leakage amount of smoke at the oil leaking hole 11 is reduced, the noise is reduced, after the smoke passes through the flow guide part, the pressure is further reduced, the air flow velocity is reduced, and the component of the smoke escaping to the inside of the shell of the range hood through the oil leaking hole is reduced, as shown in fig. 8.
The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion or/and be transported to the second portion, and may be directly communicated between the first portion and the second portion, or indirectly communicated between the first portion and the second portion via at least one third member, which may be a fluid passage such as a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber allowing the fluid to flow therethrough, or a combination thereof.
Example two:
fig. 9 shows a second preferred embodiment of the present invention. This embodiment differs from the first embodiment described above in that: the extending portions 311 are formed by extending the ends (lower ends) of two adjacent vertical plates 31 in opposite directions, and a gap is left between the extending portions 311 of two adjacent vertical plates 31 to form a silencing hole 312, so that there are a plurality of silencing holes 312 in this embodiment, as shown in fig. 9.
The resonance frequency f of the muffler unit 31a of the present embodiment satisfies:
c is the gas velocity, S ═ l × b is the cross-sectional area of the muffling holes 312, l is the upper and lower lengths of the muffling holes 312, b is the width of the muffling holes 312, and V is the volume of the muffling unit 31a, the width b of the muffling holes 312 on the diaphragm 3 gradually increases along the flow path of the gas flow, specifically, the width of the muffling holes 312 on the diaphragm 3 sequentially increases from top to bottom.
Directional terms such as "front", "rear", "upper", "lower", "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 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.
Claims (11)
1. The utility model provides a volute of centrifugal fan, is including having appearance chamber (1a) that is used for the holding impeller, oil leak hole (11) that are linked together with appearance chamber (1a) are seted up to the bottom of volute (1), its characterized in that: the oil leakage device is characterized by further comprising an oil leakage piece (2) embedded in the oil leakage hole (11), wherein the oil leakage piece (2) is locally positioned in the accommodating cavity (1a), and an oil guide channel (2a) communicated with the accommodating cavity (1a) and the outside is arranged inside the oil leakage piece (2).
2. The spiral casing of claim 1 wherein: the oil leakage part (2) comprises a main body part (21) located in the accommodating cavity (1a) and a flow guide part (22) located outside the accommodating cavity (1a), the flow guide part (22) is located below the main body part (21) and communicated with the main body part (21) to form the oil guide channel (2a), an inlet (211) communicated with the oil guide channel (2a) is formed in the main body part (21), and an outlet (223) communicated with the oil guide channel (2a) is formed in the flow guide part (22).
3. The spiral casing of claim 2 wherein: the head end (21a) of the main body part (21) is smooth and the tail end (21b) is sharp along the airflow flowing direction in the cavity (1 a).
4. The spiral casing of claim 3 wherein: the main body part (21) is provided with the inlet (211) on at least one of the two opposite side walls in the direction perpendicular to the airflow flowing direction.
5. The spiral casing of claim 4 wherein: the main body part (21) has an elongation ratio l/t, t is the largest dimension of the main body part (21) in a direction perpendicular to the airflow flowing direction, the direction perpendicular to the airflow flowing direction is substantially consistent with the axial direction of the volute (1), the elongation ratio l/t is 4.1, the cross sections of the head end (21a) and the tail end (21b) of the main body part (21) are semi-elliptical, and the cross section of the main body part (21) meets the following requirements:
Y(x)＝-0.004x4+0.0809x3-0.6003x2+2.2433x+0.02 (0≤x≤8)；
Y(x)＝7e-0.5x3-0.0111x2+0.2836x+2.9995 (8≤x≤41)。
6. the spiral casing of claim 2 wherein: the flow guide part (22) is internally provided with a transverse partition plate (3) extending transversely, a gap (3a) is reserved between the transverse partition plate (3) and at least one side wall of the flow guide part (22), and the gap (3a) is in fluid communication with the inlet (211) and the outlet (223).
7. The spiral casing of claim 6 wherein: the number of the diaphragm plates (3) is at least two, and the diaphragm plates are arranged in a staggered manner from top to bottom at intervals.
8. The spiral casing of claim 6 wherein: the lower surface of the diaphragm (3) is provided with at least two vertical plates (31) which are arranged at intervals in the vertical airflow flowing direction, the vertical plates (31) extend downwards, and a silencing unit (31a) is formed between every two adjacent vertical plates (31).
9. The spiral casing of claim 8 wherein: the tail ends of two adjacent vertical plates (31) extend oppositely to form extending parts (311), and a gap is reserved between the extending parts (311) of the two adjacent vertical plates (31) to form a silencing hole (312).
10. The spiral casing of claim 9 wherein: the resonance frequency f of the sound-deadening unit (31a) satisfies:
c is gas velocity, S ═ l ×, b is cross-sectional area of the muffling hole (312), l is upper and lower length of the muffling hole (312), b is width of the muffling hole (312), V is volume of the muffling unit (31a), and the volume is along the direction of the muffling unitAnd the width b of the silencing hole (312) on the diaphragm (3) is gradually increased along the airflow flowing path.
11. The spiral casing of any of claims 1 to 10 wherein: the oil leakage hole (11) is rectangular, the long side of the rectangle extends along the airflow flowing direction in the accommodating cavity (1a), a step part (111) is formed by bending and extending the periphery of the oil leakage hole (11) downwards, and a slot (23) for partially inserting the step part (111) of the oil leakage hole (11) into the slot is formed in the peripheral wall of the oil leakage piece (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020713042.0U CN212376959U (en) | 2020-04-30 | 2020-04-30 | Volute of centrifugal fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020713042.0U CN212376959U (en) | 2020-04-30 | 2020-04-30 | Volute of centrifugal fan |
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| CN212376959U true CN212376959U (en) | 2021-01-19 |
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| CN202020713042.0U Active CN212376959U (en) | 2020-04-30 | 2020-04-30 | Volute of centrifugal fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113531623A (en) * | 2021-08-02 | 2021-10-22 | 火星人厨具股份有限公司 | Mute direct-exhaust air duct structure and integrated stove thereof |
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2020
- 2020-04-30 CN CN202020713042.0U patent/CN212376959U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113531623A (en) * | 2021-08-02 | 2021-10-22 | 火星人厨具股份有限公司 | Mute direct-exhaust air duct structure and integrated stove thereof |
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