CN210122967U - Volute of centrifugal fan, centrifugal fan and electrical apparatus - Google Patents
Volute of centrifugal fan, centrifugal fan and electrical apparatus Download PDFInfo
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- CN210122967U CN210122967U CN201920731494.9U CN201920731494U CN210122967U CN 210122967 U CN210122967 U CN 210122967U CN 201920731494 U CN201920731494 U CN 201920731494U CN 210122967 U CN210122967 U CN 210122967U
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- 239000003507 refrigerant Substances 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 description 32
- 238000009826 distribution Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000007791 dehumidification Methods 0.000 description 3
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- 238000009827 uniform distribution Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009828 non-uniform distribution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
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Abstract
The embodiment of the utility model discloses centrifugal fan's spiral case, centrifugal fan and electrical apparatus relates to centrifugal fan technical field. The centrifugal fan is invented for solving the problem that the existing centrifugal fan has larger noise during working. The volute of the centrifugal fan comprises a volute body, wherein the volute body is provided with a volute tongue, and the radius of the volute tongue at a first position is smaller than that of the volute tongue at a second position; the distance from the first position to the air inlet end of the volute body is smaller than the distance from the second position to the air inlet end of the volute body along the axial direction of the volute body. The utility model discloses can be used to in electrical apparatus such as dehumidifier, mobile air conditioner.
Description
Technical Field
The utility model relates to a centrifugal fan technical field especially relates to a centrifugal fan's spiral case, centrifugal fan and electrical apparatus.
Background
The centrifugal fan has the advantages of large suction force, compact structure and the like, and is widely applied to electric appliances such as a dehumidifier, a mobile air conditioner and the like. The volute is one of the core components of a centrifugal fan and functions to direct the gas exiting the impeller to the volute outlet and to convert a partial dynamic pressure of the gas into a static pressure. The volute of the centrifugal fan is usually provided with a volute tongue at an air outlet, and the volute tongue can prevent a part of gas from circularly flowing in the volute. The structural design of the volute tongue is very important and is directly related to the performance of the centrifugal fan.
A volute of a centrifugal fan in the prior art, as shown in fig. 1, includes a volute body 01, and the volute body 01 has a volute tongue 011. During the operation of the centrifugal fan, the airflow enters the volute body 01 from the axial air inlet 012, passes through the impeller 02 and then flows out from the radial air outlet 013, and the airflow needs to turn 90 ° in the volute. Because the airflow needs to turn 90 degrees in the volute, the airflow is unevenly distributed along the axial direction of the volute body 01, that is, the airflow flow in the cross sections different along the axial direction of the volute body 01 is different, which easily causes the airflow to generate flow separation with the wall surface of the volute in partial cross sections, thereby generating great vortex noise and reducing the use experience of users.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a centrifugal fan's spiral case, centrifugal fan and electrical apparatus for solve the great problem of current centrifugal fan at the noise of during operation.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a volute of a centrifugal fan, including a volute body, where the volute body has a volute tongue, and a radius of the volute tongue at a first position is smaller than a radius of the volute tongue at a second position; the distance from the first position to the air inlet end of the volute body is smaller than the distance from the second position to the air inlet end of the volute body along the axial direction of the volute body.
In a second aspect, embodiments of the present invention provide a centrifugal fan, including an impeller and a volute in a first aspect, the impeller is disposed in the volute body of the volute.
In a third aspect, an embodiment of the present invention provides an electrical appliance, including the centrifugal fan described in the second aspect.
The embodiment of the utility model provides a volute of centrifugal fan, centrifugal fan and electrical apparatus, because the radius that is located the volute tongue of first position department is less than the radius that is located the volute tongue of second position department, just so can make the width of the air channel of first position department be less than the width of the air channel of second position department, so, along the axial of volute body, in the position that is close to the air inlet end of volute body, namely the position that the flow of air current is less, the width setting of air channel is less, so can improve the air current flow of this department, the air current just can be full of the air channel of this department very easily when passing through this air channel, thereby just can avoid this department's air current and the volute wall around to produce the vortex phenomenon that flow separation produced, thereby be favorable to reducing the noise that centrifugal fan produced at the during operation, reduce the influence of noise to the user, and further, the user experience can be improved. Meanwhile, the width of the ventilation channel is set to be larger at the position far away from the air inlet end of the volute body, namely the position where the flow of the airflow is larger, so that the excessive airflow in the ventilation channel at the position can be avoided, and the uniform airflow distribution in the axial section of the volute body can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a centrifugal fan in the prior art;
FIG. 2 is a cloud view of a flow field of a conventional centrifugal fan;
fig. 3 is a perspective view of a centrifugal fan in an embodiment of the present invention;
fig. 4 is a front view of a centrifugal fan in an embodiment of the present invention;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a cross-sectional view A-A of FIG. 4;
fig. 7 is a cloud view of a flow field of a centrifugal fan in an embodiment of the present invention;
fig. 8 is a schematic structural view of a dehumidifier according to some embodiments of the present invention;
FIG. 9 is a schematic structural view of a dehumidifier according to other embodiments of the present invention;
fig. 10 is a schematic structural diagram of an air conditioner according to some embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The inventor of the present invention finds, through analysis of a centrifugal fan in the prior art, as shown in fig. 1, that an impeller 02 of the centrifugal fan has a weak power at a position close to an air inlet 012 on a volute body 01, and has a strong power at a position far away from the air inlet 012 of the volute body 01, that is, along an axial direction of the volute body 01, and the flow rate of an air flow in a section close to the air inlet 012 of the volute body 01 is small, and the flow rate of an air flow in a section far away from the air inlet 012 of the volute body 01 is large, because the air flow needs to turn to 90 ° when the centrifugal fan works, the air flow turns to bend at the air inlet 012 close to the volute body 01 and is urgent, and the energy loss is large, so the flow rate of the air flow in the section close to the air inlet 012 of the volute body 01 is small; the air flow at the position of the air inlet 012 far away from the volute body 01 bends relatively gently, and the energy loss is relatively small, so the flow rate of the air flow in the section of the air inlet 012 far away from the volute body 01 is large. In the centrifugal fan in the prior art, the radius of the volute tongue 011 is constant along the axial direction of the volute body 01, and the size of each section of the air duct in the volute body 01 along the axial direction is equal, because the flow rate of the air flow in the axial section close to the air inlet 012 of the volute body 01 is small, the air flow is not easy to fill the ventilation channel at the position close to the air inlet 012 of the volute body 01, so that the air flow is separated from the wall surface of the volute body 01 around the position, and the air flow generates a vortex at the position (as shown in fig. 2, the color depth indicates the speed), thereby generating a great noise.
Based on the above analysis, in a first aspect, the present invention provides a volute of a centrifugal fan, as shown in fig. 3, 4 and 5, including a volute body 1, where the volute body 1 has a volute tongue 11, and on the volute tongue 11, a radius of the volute tongue 11 located at a first position M1 is smaller than a radius of the volute tongue 11 located at a second position M2; along the axial direction of the volute body 1, the distance from the first position M1 to the air inlet end of the volute body 1 is smaller than the distance from the second position M2 to the air inlet end of the volute body 1.
As shown in fig. 3, since the radius of the volute tongue 11 at the first position M1 is smaller than the radius of the volute tongue 11 at the second position M2, so that the width of the ventilation channel 14 at the first position M1 is smaller than the width of the ventilation channel 14 at the second position M2 (i.e. the smaller the radius of the volute tongue 11, the smaller the width d of the ventilation channel 14), the width d of the ventilation channel 14 is set smaller at a position close to the air inlet end of the volute body 1 along the axial direction of the volute body 1, i.e. a position where the flow rate of the air flow is smaller, so that the air flow rate at that position can be increased, the ventilation channel 14 can be easily filled by the air flow when the air flow passes through the ventilation channel 14, and thus the vortex phenomenon (shown in fig. 7, the color depth represents the speed), thereby being beneficial to reducing the noise generated by the centrifugal fan during working, reducing the influence of the noise on the user and further improving the experience of the user. Meanwhile, the width d of the ventilation channel 14 is set to be larger at a position far away from the air inlet end of the volute body 1, namely, a position where the flow of the airflow is larger, so that the excessive airflow in the ventilation channel 14 at the position can be avoided, and the uniform airflow distribution in the axial section of the volute body 1 can be ensured.
In the above embodiment, the setting of the radius of the volute tongue 11 along the axial direction of the volute body 1 is not exclusive, and for example, the following manner can be adopted: as shown in fig. 3, the radius of the volute tongue 11 gradually increases along the axial direction of the volute body 1 and along the direction of the inlet air of the volute body 1, that is, the radius of the volute tongue 11 is continuously changed. In addition, the following method is also possible: the volute tongue 11 is provided with a plurality of volute tongue sections which are sequentially connected along the axial direction of the volute body 1, the radius of each volute tongue section is constant, and the radius of the volute tongue section close to the air inlet end of the volute body 1 is smaller than the radius of the volute tongue section far away from the air inlet end of the volute body 1; i.e. the radius of the volute tongue 11 is changed in a stepwise manner. Because the distribution of the airflow in the axial direction of the volute body 1 is continuously changed, compared with the latter, the radius of the volute tongue 11 of the former is continuously changed, so that the width d of the ventilation channel 14 is continuously changed, the problem of uneven distribution of the airflow in the ventilation channel 14 in the axial direction of the volute body 1 can be better solved, and the uniform distribution of the airflow flow rate of the ventilation channel 14 in each section in the axial direction of the volute body 1 can be better ensured.
In the volute body 1, when the radius of the volute tongue 11 is within the range of (0.02-0.1) D (D is the diameter of the impeller 200) along the axial direction of the volute body 1, the width D of the ventilation channel 14 can be in the optimum range, and at this time, the maximum width D of the ventilation channel 14 is in the optimum rangemaxNot too wide, minimum width dminThe air flow distribution in the axial direction of the volute body 1 in the ventilation channel 14 is uniform.
In the volute of the centrifugal fan, the depth L of the volute tongue 11 is not unique, for example, the depth L of the volute tongue 11 may be variable along the axial direction of the volute body 1, as shown in fig. 3 and 4, and the depth of the volute tongue 11 at the first position M1 is greater than the depth of the volute tongue 11 at the second position M2. In addition, the depth L of the volute tongue 11 may be constant in the axial direction of the volute body 1. Compared with the embodiment that the depth L of the volute tongue 11 is constant, in the embodiment that the depth L of the volute tongue 11 is changed, the width d of the ventilation channel 14 can be further accurately adjusted through matching the depth L of the volute tongue 11 with the radius R of the volute tongue 11, so that in the axial direction of the volute body 1, the width of the ventilation channel 14 at the position close to the air inlet end of the volute body 1 is smaller than the width of the ventilation channel 14 at the position far from the air inlet end of the volute body 1, the ventilation channel 14 is filled with the air flow at the air inlet end close to the volute body 1, the vortex phenomenon generated by flow separation of the air flow and the surrounding volute wall surface is avoided, and the noise generated by the centrifugal fan during operation is more favorably reduced. Meanwhile, too much airflow in the ventilation channel 14 at the air inlet end far away from the volute body 1 can be avoided, so that the airflow distribution in the section along the axial direction of the volute body 1 can be ensured to be more uniform.
As shown in fig. 4, the depth L of the volute tongue 11 specifically refers to: the distance from the tongue tip of the volute tongue 11 (i.e. the top end of the volute tongue 11) to the first plane 3, the first plane 3 is a plane parallel to the axis 5 of the volute body 1 and perpendicular to the air outlet plane 4 of the volute body 1, and the first plane 3 is tangent to the middle of the inner wall of the curved air duct 6 in the volute body 1; as shown in fig. 4, the middle of the inner wall of the curved duct 6 of the volute body 1 refers to the portion of the curved duct 6 except the initial end a and the terminal end B along the extending direction of the profile of the curved duct 6 in the volute body 1. The starting end A of the curve air duct 6 refers to one end of the curve air duct 6 with a small distance from the axis 5 of the volute body 1, and the tail end B of the curve air duct 6 refers to one end of the curve air duct 6 with a large distance from the axis 5 of the volute body 1. The larger the depth L of the volute tongue 11 is, the smaller the width d of the ventilation channel 14 between the volute tongue 11 and the wall surface of the volute body 1 opposite to the volute tongue 11 is; conversely, the smaller the depth L of the volute tongue 11, the larger the width d of the ventilation channel 14 between the volute tongue 11 and the wall surface of the volute body 1 opposite to the volute tongue 11.
In the embodiment where the depth of the volute tongue 11 varies, the depth of the volute tongue 11 is not distributed in a unique manner along the axial direction of the volute body 1, such as the following manner: as shown in fig. 3 and 4, the depth of the volute tongue 11 gradually decreases along the axial direction of the volute body 1 and along the direction of the inlet air of the volute body 1 (for example, the X direction shown in fig. 3), that is, the depth of the volute tongue 11 is continuously changed. In addition, the following method is also possible: the volute tongue 11 is provided with a plurality of volute tongue sections which are sequentially connected along the axial direction of the volute body 1, the depth of each volute tongue section is constant, and the depth of the volute tongue section close to the air inlet end of the volute body 1 is larger than the depth of the volute tongue section far away from the air inlet end of the volute body 1; i.e. the depth of the volute tongue 11 is changed in a stepwise manner. Because the distribution of the airflow in the axial direction of the volute body 1 is continuously changed, compared with the latter, the depth of the volute tongue 11 of the former is continuously changed, so that the width d of the ventilation channel 14 can be continuously changed, the problem of non-uniform distribution of the airflow in the axial direction of the volute body 1 is well solved, and the uniform distribution of the airflow flow in each section in the axial direction of the volute body 1 is ensured.
In the volute body, along the axial direction of the volute body 1, when the depth range of the volute tongue 11 is (0.6-1.0) C, the width d of the ventilation channel 14 can be in the optimal range by matching with the radius of the volute tongue 11, and at the moment, the maximum width d of the ventilation channel 14 ismaxNot too wide, minimum width dminThe air flow distribution in the axial direction of the volute body 1 in the ventilation channel 14 is uniform.
As shown in fig. 4, C is the size of the air opening of the volute body 1, the air opening is the distance from the axis 5 of the volute body 1 to the second plane 7, the second plane 7 is a plane parallel to the axis 5 of the volute body 1 and perpendicular to the air outlet plane 4 of the volute body 1, and the second plane 7 is tangent to the inner wall of the tail end B of the curved air duct 6 of the volute body 1, for example, as shown in fig. 4, the second plane 7 coincides with the inner wall of the ventilation channel 14 opposite to the volute tongue 11.
The embodiment of the utility model provides a centrifugal fan's spiral case can be single suction centrifugal fan's spiral case, also can be double suction centrifugal fan's spiral case, does not do specifically and prescribe a limit to here.
In a second aspect, the embodiment of the present invention provides a centrifugal fan, as shown in fig. 3, including an impeller 200 and the volute 100 described in the first aspect, the impeller 200 is disposed in the volute body 1 of the volute 100.
The centrifugal fan can be a single-suction centrifugal fan or a double-suction centrifugal fan, and is not particularly limited herein; the centrifugal fan can be applied to household appliances such as a dehumidifier and a mobile air conditioner, and can also be applied to other appliances needing to drive air to flow.
The embodiment of the utility model provides a technical problem that centrifugal fan solved and the technological effect who gains all are the same with the technological problem that centrifugal fan's in the first aspect spiral case solved and the technological effect who gains, no longer give unnecessary details here.
In the centrifugal fan, the arrangement of the gap between the volute tongue 11 and the impeller 200 is not exclusive, for example, the gap t between the volute tongue 11 and the impeller 200 may be variable along the axial direction of the volute body 1: as shown in fig. 6, the clearance between the volute tongue 11 and the impeller 200 at the first position M1 is smaller than the clearance between the volute tongue 11 and the impeller 200 at the second position M2.
In addition, the clearance t between the volute tongue 11 and the impeller 200 may also be constant along the axial direction of the volute body 1 and along the direction of the inlet air of the volute body 1. Compared with the embodiment in which the gap t between the volute tongue 11 and the impeller 200 is constant, in the embodiment in which the gap t between the volute tongue 11 and the impeller 200 is variable, the size t of the gap between the volute tongue 11 and the impeller 200 is smaller at a position close to the air inlet end of the volute body 1 (i.e., a position where the air flow distribution is relatively small) in the axial direction of the volute body 1, so that the air flow at the position can be prevented from entering the cavity of the volute body 1 through the gap too much to continue circulating, and thus the air flow at the position is prevented from being too little; at a position far away from the air inlet end of the volute body 1 (i.e. at a position where the air flow is relatively more distributed), the gap between the volute tongue 11 and the impeller 200 is larger, so that the air flow at that position can relatively more enter the cavity of the volute body 1 through the gap to continue circulating, and the difference between the air flow at that position and the air flow at other positions can be reduced. Through the arrangement, the uniformity of the air flow distribution in the axial direction of the volute body 1 is ensured, and the air flow is fully filled with the ventilation channel 14 along the axial direction of the volute body 1, so that the vortex phenomenon generated by flow separation between the air flow and the surrounding volute wall surface can be better avoided, and the reduction of the noise generated by the centrifugal fan during the work is further facilitated.
In the embodiment where the clearance between the volute tongue 11 and the impeller 200 is varied, the clearance between the volute tongue 11 and the impeller 200 is not set in the axial direction of the volute body 1, and may be set as follows: as shown in fig. 6, the clearance between the volute tongue 11 and the impeller 200 gradually increases along the axial direction of the volute body 1 and along the direction of the inlet air of the volute body 1, that is, the clearance between the volute tongue 11 and the impeller 200 is continuously changed. In addition, the following method is also possible: the volute tongue 11 is provided with a plurality of volute tongue sections which are sequentially connected along the axial direction of the volute body 1, the gap between each volute tongue section and the impeller 200 is constant, and the gap between the volute tongue section close to the air inlet end of the volute body 1 and the impeller 200 is larger than the gap between the volute tongue section far away from the air inlet end of the volute body 1 and the impeller 200, namely the gap between the volute tongue 11 and the impeller 200 is changed in a sectional manner. Since the distribution of the airflow in the axial direction of the volute body 1 is continuously changed, compared with the latter, the gap between the volute tongue 11 and the impeller 200 of the former is continuously changed, so that the problem of non-uniform distribution of the airflow in the axial direction of the volute body 1 in the ventilation channel 14 can be better solved, and the uniform distribution of the airflow flow in the cross section in the axial direction of the volute body 1 can be better ensured.
In the volute body 1, along the axial direction of the volute body 1, when the range of the clearance between the volute tongue 11 and the impeller 200 is (0.02-0.12) D (D is the diameter of the impeller), the minimum clearance between the volute tongue 11 and the impeller 200 is not too small, and the maximum clearance between the volute tongue 11 and the impeller 200 is also not too large, so that the amount of gas entering the cavity of the volute body 1 again at each position in the axial direction of the volute body 1 to continue to circulate can be better controlled, and the amount of gas in the axial direction of the volute body 1 in the ventilation channel 14 tends to be equal.
In a third aspect, an embodiment of the present invention provides an electrical appliance, including the centrifugal fan described in the second aspect.
The embodiment of the utility model provides a technical problem that the electrical apparatus solved and the technological effect who gains all are the same with the technological problem that centrifugal fan in the second aspect solved and the technological effect who gains, no longer give unnecessary details here.
The electric appliance can be an electric appliance with a centrifugal fan, such as a dehumidifier, a mobile air conditioner, an air duct machine, a range hood and the like.
In the embodiment that the electric appliance is a dehumidifier, the specific structure of the dehumidifier is not exclusive, and for example, the specific structure may be as follows: as shown in fig. 8, the dehumidifier includes a first casing 400, a first evaporator 500, a first condenser 600 and a centrifugal fan 300 are disposed in the first casing 400, the first evaporator 500 and the first condenser 600 are connected to a refrigerant circulation pipeline, an air inlet 410 and a first air outlet 420 are disposed on the first casing 400, and the centrifugal fan 300 can draw air outside the first casing 400 into the first casing 400 through the air inlet 410 and discharge the air through the first outlet 420 after passing through the first evaporator 500 and the first condenser 600 in sequence. The dehumidification principle of the dehumidifier is as follows: the centrifugal fan 300 draws the humid air into the first casing 400, the humid air passes through the first evaporator 500, the moisture in the humid air is condensed on the first evaporator 500 by using the temperature difference between the first evaporator 500 and the humid air (the temperature of the first evaporator 500 is lower), so as to achieve the purpose of dehumidification, and then the humid air passes through the first condenser 600 to dissipate heat from the first condenser 600 and the centrifugal fan 300, and finally is discharged from the first air outlet 420.
Further, the following structure is also possible: as shown in fig. 9, the dehumidifier includes a first casing 400, a first evaporator 500, a first condenser 600 and a centrifugal fan 300 are disposed in the first casing 400, the first evaporator 500 and the first condenser 600 are connected to a refrigerant circulation pipeline, a first air inlet 411, a second air inlet 412 and a first air outlet 420 are disposed on the first casing 400, the centrifugal fan 300 can draw air outside the first casing 400 into the first casing 400 through the first air inlet 411 and discharge the air through the first air outlet 420 after passing through the first evaporator 500, and the centrifugal fan 300 can draw air outside the first casing 400 into the first casing 400 through the second air inlet 412 and discharge the air through the first condenser 600 and the first air outlet 420. When the dehumidifier starts to work, the centrifugal fan 300 pumps the air outside the first casing 400 into the first casing 400 through the first air inlet 411 and passes through the first evaporator 500, when the air passes through the first evaporator 500 with a lower temperature, the moisture in the air flow meets the condensation and is combined on the first evaporator 500, so as to achieve the purpose of dehumidification, the dehumidified air is discharged from the first air outlet 420, meanwhile, the centrifugal fan 300 also pumps the air outside the first casing 400 into the first casing 400 through the second air inlet 412 and passes through the first condenser 600 with a higher temperature, at this time, the air flow can take away the heat of the refrigerant in the first condenser 600, so as to achieve the purpose of heat dissipation of the first condenser 600, and the heat-exchanged air is discharged from the first air outlet 420. Compared with the embodiment shown in fig. 8, in the embodiment shown in fig. 9, because the two air inlets 410 are formed in the first casing 400, the air entering from one of the air inlets 410 only passes through one heat exchange part of the first evaporator 500 or the first condenser 600, so that the air inlet resistance is greatly reduced, the air pressure of the air on the air inlet side of the first evaporator 500 and the first condenser 600 is reduced, the air speed of the air passing through the first evaporator 500 or the first condenser 600 is reduced, the vibration of the fins of the first evaporator 500 or the first condenser 600 is reduced, and the noise generated by the first evaporator 500 or the first condenser 600 is reduced.
In the embodiment where the first casing 400 of the dehumidifier is provided with the first air inlet 411 and the second air inlet 412, the centrifugal fan 300 may be arranged in a different manner, for example, two single-suction centrifugal fans may be arranged back to back, and in addition, as shown in fig. 9, a double-suction centrifugal fan may also be arranged. Compared with the back-to-back arrangement of two single-suction centrifugal fans and the arrangement of a double-suction centrifugal fan, the occupied space of the centrifugal fan 300 can be greatly reduced, the overall size of the purification dehumidifier is reduced, the structure of the dehumidifier is simplified, and the disassembly and assembly of the dehumidifier are facilitated.
In the embodiment that the electric appliance is an air conditioner, as shown in fig. 10, the air conditioner includes a second casing 700, a second evaporator 800, a second condenser 900 and a centrifugal fan 300 are disposed in the second casing 700, the second evaporator 800 and the second condenser 900 are connected to a refrigerant circulation pipeline, a third air inlet 710 and a second air outlet 720 are disposed on the second casing 700, and the centrifugal fan 300 can draw air outside the second casing 700 into the second casing 700 through the third air inlet 710 and discharge the air through the second evaporator 800 and the second air outlet 720. In operation, the centrifugal fan 300 draws air into the second casing 700, the air passes through the second evaporator 800 and generates heat exchange, the temperature of the air is reduced, and then the air passes through the centrifugal fan 300 and is finally discharged from the second air outlet 720.
In the air flowing direction, the centrifugal fan 300 may be disposed in front of the second evaporator 800, that is, the air outlet of the centrifugal fan 300 is opposite to the second evaporator 800; it may be disposed at the rear of the second evaporator 800 as shown in fig. 10, that is, the air inlet of the centrifugal fan 300 is opposite to the second evaporator 800.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A volute of a centrifugal fan, comprising a volute body having a volute tongue, wherein on the volute tongue, a radius of the volute tongue at a first position is smaller than a radius of the volute tongue at a second position; the distance from the first position to the air inlet end of the volute body is smaller than the distance from the second position to the air inlet end of the volute body along the axial direction of the volute body.
2. The volute of a centrifugal fan of claim 1, wherein the radius of the volute tongue increases gradually in an axial direction of the volute body and in a direction of the inlet air of the volute body.
3. A centrifugal fan comprising an impeller and a volute of any of claims 1 or 2, the impeller being disposed within a volute body of the volute.
4. The centrifugal fan as claimed in claim 3, wherein the radius of the volute tongue in the axial direction of the volute body is in the range of (0.02-0.1) D; wherein D is the diameter of the impeller.
5. The centrifugal fan according to claim 3 or 4, wherein a clearance between the volute tongue and the impeller at the first position is smaller than a clearance between the volute tongue and the impeller at the second position.
6. The centrifugal fan as claimed in claim 5, wherein the clearance between the volute tongue and the impeller is gradually increased along the axial direction of the volute body and along the direction of the inlet air of the volute body.
7. The centrifugal fan as claimed in claim 5, wherein a clearance between the volute tongue and the impeller in an axial direction of the volute body is in a range of (0.02-0.12) D; wherein D is the diameter of the impeller.
8. An electrical appliance comprising a centrifugal fan according to any one of claims 3 to 7.
9. The appliance according to claim 8, characterized in that it is a dehumidifier.
10. The electrical apparatus according to claim 9, wherein the dehumidifier includes a first housing, a first evaporator, a first condenser and the centrifugal fan are disposed in the first housing, the first evaporator and the first condenser are connected to a refrigerant circulation pipeline, the first housing is provided with a first air inlet, a second air inlet and a first air outlet, the centrifugal fan can draw air outside the first housing into the first housing through the first air inlet and discharge the air through the first evaporator and the first air outlet, and the centrifugal fan can draw air outside the first housing into the first housing through the second air inlet and discharge the air through the first condenser and the first air outlet.
11. The electrical appliance according to claim 8, wherein the electrical appliance is an air conditioner, the air conditioner includes a second housing, a second evaporator, a second condenser and the centrifugal fan are disposed in the second housing, the second evaporator and the second condenser are connected to a refrigerant circulation pipeline, a third air inlet and a second air outlet are disposed on the second housing, and the centrifugal fan can draw air outside the second housing into the second housing through the third air inlet and discharge the air through the second evaporator and the second air outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920731494.9U CN210122967U (en) | 2019-05-21 | 2019-05-21 | Volute of centrifugal fan, centrifugal fan and electrical apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920731494.9U CN210122967U (en) | 2019-05-21 | 2019-05-21 | Volute of centrifugal fan, centrifugal fan and electrical apparatus |
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| CN210122967U true CN210122967U (en) | 2020-03-03 |
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| CN201920731494.9U Active CN210122967U (en) | 2019-05-21 | 2019-05-21 | Volute of centrifugal fan, centrifugal fan and electrical apparatus |
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| Country | Link |
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