CN111911425A - Centrifugal fan and air conditioner - Google Patents
Centrifugal fan and air conditioner Download PDFInfo
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- CN111911425A CN111911425A CN202010618302.0A CN202010618302A CN111911425A CN 111911425 A CN111911425 A CN 111911425A CN 202010618302 A CN202010618302 A CN 202010618302A CN 111911425 A CN111911425 A CN 111911425A
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- impeller
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- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 238000005192 partition Methods 0.000 claims description 12
- 230000000737 periodic effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of air supply equipment, particularly provides a centrifugal fan and an air conditioner, and aims to solve the problem that the air supply distance of the existing centrifugal fan is short. The centrifugal fan comprises a volute, an impeller, a circumferential sliding plate and a driving mechanism; the impeller is rotatably arranged in the volute, an exhaust port is formed in the circumferential direction of the volute, the circumferential sliding plate can be connected to the volute in the wind collecting area in a sliding mode along the circumferential direction, and a volute tongue protruding into the volute is arranged at the exhaust port; the driving mechanism is used for driving the circumferential sliding plate to circumferentially slide between a first limit position and a second limit position relative to the volute; when the circumferential sliding plate is located at the first limit position, a first radial clearance amount between the volute tongue and the impeller is smaller than a second radial clearance amount between the volute tongue and the impeller when the circumferential sliding plate is located at the second limit position. The periodic change of the radial gap between the volute tongue and the impeller can add disturbance to the airflow, vortex ring airflow can be formed at the exhaust port, and the air supply distance of the centrifugal fan can be increased by the vortex airflow.
Description
Technical Field
The invention belongs to the technical field of air supply equipment, and particularly provides a centrifugal fan and an air conditioner.
Background
The typical structure of the centrifugal fan comprises a volute, an impeller and a driving motor; the impeller is rotatably installed in the volute and is driven by the driving motor to rotate relative to the volute, the volute is provided with an air suction port in the rotating shaft direction of the impeller and an air exhaust port in the circumferential direction, and the shape of the volute in the circumferential direction of the impeller is a logarithmic spiral line. The performance of the fan is good, the efficiency is mainly determined by the impeller, but the shape and the size of the volute also have an influence on the performance.
The volute is used for collecting the gas thrown out of the impeller and enabling the gas to flow to the exhaust port, and in the flowing process, the gas obtains a part of dynamic pressure energy from the impeller and is converted into static pressure energy, and certain wind pressure is formed. Since the circumferential shape of the volute is a logarithmic spiral and the impeller is circular, the radial clearance between the volute and the impeller is in a gradual change state along the circumferential direction of the impeller, and in general, a volute area with a large radial clearance between the volute and the impeller is called a diffusion area, and a volute area with a small radial clearance between the volute and the impeller is called a wind collection area. The circumferential shell of the volute is provided with a tongue-shaped structure which is protruded towards the interior of the volute at an exhaust port positioned in the wind collecting area and is generally called a volute tongue, and the volute tongue can prevent gas from circularly flowing in the volute. In actual use, the problem that the air supply distance of the existing centrifugal fan is short is found.
In view of this, how to increase the air supply distance of the centrifugal fan is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the problem of short air supply distance of the centrifugal fan in the prior art, the invention provides the centrifugal fan on the one hand.
The centrifugal fan comprises a volute and an impeller, wherein the impeller is rotatably arranged in the volute, and an exhaust port is formed in the circumferential direction of the volute, and the centrifugal fan is characterized by further comprising: a circumferential sliding plate connected to the volute in a circumferentially slidable manner at a wind collecting area and having a volute tongue protruding into the volute at the exhaust port; the driving mechanism is used for driving the circumferential sliding plate to circumferentially slide between a first limit position and a second limit position relative to the volute; a first radial clearance t between the volute tongue and the impeller when the circumferential sliding plate is positioned at a first limit position1Is smaller than a second radial clearance t between the volute tongue and the impeller when the volute tongue is positioned at a second extreme position2。
In a preferable embodiment of the centrifugal fan according to the present invention, the first radial clearance t is smaller than the second radial clearance t1D is (0.02-0.05), wherein D represents the diameter of the impeller.
In a preferable embodiment of the centrifugal fan according to the present invention, the second radial gap amount t is set to be smaller than the first radial gap amount t2(0.1-0.15) D, wherein D represents the diameter of the impeller.
In a preferable embodiment of the centrifugal fan of the present invention, the circumferential sliding plate includes a sliding connection plate, a volute tongue and an air deflector, which are sequentially arranged along a circumferential direction of the impeller; the sliding connecting plate is an arc plate matched with the circumferential direction of the volute; the volute tongue is an arc plate protruding from the end part of the sliding connecting plate to the inside of the volute; the air deflector is a straight plate extending from the end part of the volute tongue to the direction far away from the volute casing.
In a preferable embodiment of the centrifugal fan according to the present invention, the volute includes a volute circumferential plate and two side plates, the volute circumferential plate includes a straight plate and a spiral line plate, the spiral line plate is formed by extending an end portion of the straight plate along a circumferential direction of the impeller in a logarithmic spiral, the two side plates, the straight plate and the spiral line plate are assembled to enclose a cavity and the exhaust port, and the circumferential sliding plate is connected to the spiral line plate in a manner of being slidable in the circumferential direction.
In a preferable embodiment of the centrifugal fan according to the present invention, the air deflector is inclined toward the spiral plate side, and a plane of the air deflector intersects with the straight plate.
In a preferable embodiment of the centrifugal fan of the present invention, the driving mechanism includes a motor, a supporting plate and a push rod; one end of the push rod is fixedly connected with the circumferential sliding plate, the other end of the push rod is fixedly connected with an armature shaft of the motor, the axis of the armature shaft is collinear with the central line of the circumferential sliding plate, and the support plate is fixedly connected with the volute.
In a preferable embodiment of the centrifugal fan according to the present invention, the number of the driving mechanisms is two, and the two driving mechanisms are symmetrically disposed on both sides of the volute with respect to the impeller.
The centrifugal fan comprises a volute and an impeller, wherein the impeller is rotatably arranged in the volute, and an exhaust port is formed in the circumferential direction of the volute, and the centrifugal fan is characterized by further comprising: a circumferential sliding plate connected to the volute in a circumferentially slidable manner at a wind collecting area and having a volute tongue protruding into the volute at the exhaust port; the driving mechanism is used for driving the circumferential sliding plate to circumferentially slide between a first limit position and a second limit position relative to the volute; a first radial clearance t between the volute tongue and the impeller when the circumferential sliding plate is positioned at a first limit position1Is smaller than a second radial clearance t between the volute tongue and the impeller when the volute tongue is positioned at a second extreme position2。
The volute tongue of the centrifugal fan slides in the circumferential direction between the first limit position and the second limit position relative to the volute, the opening degree of the exhaust port of the centrifugal fan can be adjusted, and then the air output of the centrifugal fan is adjusted, namely the larger the opening degree of the exhaust port is, the larger the air output of the centrifugal fan is, and the smaller the air output of the centrifugal fan is. More importantly, compared with the prior art that the radial clearance between the volute tongue and the impeller is fixed, when the volute tongue of the centrifugal fan slides between the first limit position and the second limit position relative to the volute, the radial clearance between the volute tongue and the impeller changes periodically, when the volute tongue is located at the first limit position, the radial clearance between the volute tongue and the impeller is minimum, the volute tongue is located at the deep tongue position, when the volute tongue is located at the second limit position, the radial clearance between the volute tongue and the impeller is maximum, and when the volute tongue is located at the shallow tongue position, the periodic change of the radial clearance between the volute tongue and the impeller increases disturbance to airflow to form vortex, vortex ring airflow is formed at an exhaust port of the volute, and the vortex airflow increases the air supply distance of the centrifugal fan.
On the other hand, the invention also provides an air conditioner, which comprises a shell and the centrifugal fan arranged in the shell, wherein the centrifugal fan is specifically the centrifugal fan. It will be appreciated by those skilled in the art that the air conditioner has the full technical effect of the centrifugal fan described above.
In the preferable scheme of the air conditioner of the present invention, the air conditioner further includes a partition board, the partition board divides the housing into a first sub-housing and a second sub-housing, the first sub-housing is provided with an air inlet, the second sub-housing is provided with an air outlet, the centrifugal fan is located in the first sub-housing and is fixedly connected with the partition board, the partition board is provided with a through hole communicated with the air outlet of the volute, and the second sub-housing is internally provided with a heat exchanger.
Drawings
FIG. 1 is a schematic view of the internal structure of an air conditioner with a circumferential slide plate of a centrifugal fan in a first extreme position;
FIG. 2 is a schematic view of the internal structure of the air conditioner with the circumferential slide plate of the centrifugal fan at a second limit position;
FIG. 3 is a schematic structural view of an assembly of a centrifugal fan;
FIG. 4 is an exploded view of a centrifugal fan;
fig. 5 and 6 are schematic diagrams of two-dimensional and three-dimensional structures of the circumferential sliding plate, respectively.
Wherein, the corresponding relationship between each component name and the reference number in fig. 1 to 6 is:
1, a shell body: 10 a first sub-shell, 11 a second sub-shell, 1i air inlets and 1o air outlets;
2, centrifugal fan: 2k diffusion area, 2j wind collection area, 20 volute, 20i air suction port, 20o air exhaust port, 200 straight plate, 201 spiral line plate, 202 side plate, 21 impeller, 210 hub, 211 blade, 22 circumferential sliding plate, 220 sliding connecting plate, 221 volute tongue, 222 air deflector, 223 limit plate, 23 support plate, 24 motor and 25 push rod;
3, a heat exchanger;
4, a partition board;
5 current collector.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, the terms of orientation used herein in describing the structure of the assembly are both set with reference to the impeller, circumferential referring to the circular path formed by the rotation of the impeller about its axis, radial referring to the direction indicated by the diameter of the impeller, and the terms of orientation "inner and outer" set with reference to the volute, inside the volute and outside the volute.
For better understanding, the following will explain the structure and the operation principle of the centrifugal fan in detail by applying the centrifugal fan to an air conditioner with reference to the drawings, and it is understood that the centrifugal fan may be applied to other devices, and the present embodiment is not limited to the application thereof.
Referring to the schematic diagram of the internal structure of the air conditioner when the circumferential sliding plate of the centrifugal fan shown in fig. 1 is located at the first limit position, the air conditioner comprises a shell 1, a centrifugal fan 2 and a heat exchanger 3; wherein, the casing has air intake 1i and air outlet 1o, has fixed installation centrifugal fan 2 and heat exchanger 3 in order in the casing along the air current flow direction, and centrifugal fan 2's air exit towards heat exchanger 3. To facilitate better understanding of the structure of the air conditioner, please refer to fig. 2 together, and fig. 2 is a schematic diagram of the internal structure of the air conditioner when the circumferential sliding plate of the centrifugal fan is located at the second limit position.
The working principle of the air conditioner is as follows: the centrifugal fan 2 is started, when the impeller 21 rotates, an air pressure difference is formed between the inside and the outside of the shell 1, airflow is sucked into the shell under the action of the air pressure difference, is ejected out of the blades 211 of the impeller 21 and then is discharged from the air outlet 20o of the centrifugal fan 2, the discharged airflow exchanges heat through the heat exchanger 3, and finally is sent out of the shell 1 through the air outlet 1o of the shell.
With continued reference to fig. 1 and 2, the centrifugal fan 2 includes a volute 20 and an impeller 21, the impeller 21 is rotatably mounted in the volute 20, and an exhaust port 20o is formed in the circumferential direction of the volute 20. The centrifugal fan 2 further comprises a circumferential sliding plate 22 and a driving mechanism; wherein, the circumferential sliding plate 22 is connected to the volute casing 20 at the wind collecting area 2j in a manner of being slidable along the circumferential direction, and a volute tongue 221 protruding into the volute casing 20 is arranged at the exhaust port 20o, and the driving mechanism is used for driving the circumferential sliding plate 22 to circumferentially slide between a first limit position and a second limit position relative to the volute casing 20 so as to adjust the opening degree of the exhaust port 20 o. And is configured to: a first radial clearance t between the volute tongue 221 and the impeller 21 when the circumferential sliding plate 22 is located at the first limit position1Is smaller than a second radial clearance t between the volute tongue 221 and the impeller 21 when the circumferential sliding plate 22 is positioned at the second limit position2。
For better understanding, specific structure and operation principle of the centrifugal fan 2 are described in detail below with reference to fig. 1 to 6, wherein fig. 3 is a schematic structural diagram of an assembly of the centrifugal fan, fig. 4 is a schematic structural diagram of an explosion of the centrifugal fan, and fig. 5 and 6 are schematic structural diagrams of a circumferential sliding plate in two dimensions and three dimensions, respectively.
In detail, referring to fig. 3 and 4, the volute 20 includes a volute circumferential plate and two side plates 202, the volute circumferential plate includes a straight plate 200 and a spiral line plate 201 formed by extending an end of the straight plate 200 along a circumferential direction of the impeller 21 according to a logarithmic spiral, the two side plates 202, the straight plate 200 and the spiral line plate 201 are assembled to enclose a cavity and the exhaust port 20o, and the circumferential sliding plate 22 is connected to the spiral line plate 201 in a manner of sliding in the circumferential direction. Specifically, two curb plates 202 set up respectively in the left and right sides of spiral case 20 and all enclose with spiral case circumference board fixed connection and close and form cavity and gas vent 20o, seted up induction port 20i on one of two curb plates 202, the dead eye has been seted up to the other, and impeller 21 rotationally sets up in the cavity, and the axis of rotation of impeller 21 and the central line collineation between induction port 20i and the dead eye. In this arrangement, when the impeller 21 rotates, the air flow is sucked between the blades 211 of the impeller 21 through the air inlet 20i and is finally discharged through the air outlet 20 o. It should be noted that the terms "left and right" used in describing the scroll structure are set with reference to the centrifugal fan of fig. 3 viewed from the exhaust port 20o of the centrifugal fan 2 from the perspective of the reader, and are positioned on the right hand side of the reader as the right side and on the left hand side of the reader as the left side.
It can be seen that, in the present embodiment, the volute casing 20 is an assembly body formed by splicing and assembling the volute casing circumferential plate and the two side plates 202, and it can be understood that, on the basis of meeting the requirements of the machining process and the assembly process for installing the impeller 21, the volute casing 20 may also be an integrally formed structure.
With continued reference to fig. 3 and 4, impeller 21 includes a hub 210, a motor 24, and a plurality of blades 211; the plurality of blades 211 are fixed to the hub 210 at intervals in the circumferential direction, the motor 24 is directly and fixedly connected to the volute 20, that is, the housing of the motor 24 is fixedly connected to the volute 20 by a fastening member such as a bolt or directly welded to the volute 20, or the motor 24 is indirectly and fixedly connected to the volute 20, for example, the housing of the motor 24 and the volute 20 are both fixedly connected to the housing 1 of the air conditioner by a fastening member such as a bolt or directly welded to the housing 1. The armature shaft of the motor 24 is rotatably connected to the volute 20 through a rotating bearing and is fixedly connected to the hub 210 through a key connection or a bolt connection, so that when the armature shaft of the motor 24 rotates, the hub 210 is driven to rotate and then the blades 211 are driven to rotate together with the hub. It is to be understood that the fitting relationship between the impeller 21 and the scroll casing 20 is not limited to this structure in the present embodiment.
Based on the shape of the volute circumferential plate in conjunction with fig. 1 to 4, the radial gap between the impeller 21 and the inner side wall of the volute 20 gradually decreases in the circumferential direction, a region with a larger radial gap between the impeller 21 and the volute 20 is referred to as a diffusion region 2k, a region with a smaller radial gap between the impeller 21 and the volute 20 is referred to as a wind collecting region 2j, a straight plate 200 of the volute 20 is located in the diffusion region 2k, and a side of the spiral line plate 201 away from the straight plate 200 is located in the wind collecting region 2 j.
As can be seen from fig. 5 and 6 in addition to fig. 1 to 4, the centrifugal fan 2 further includes a circumferential sliding plate 22, and the circumferential sliding plate 22 includes a sliding connection plate 220, a volute tongue 221 and a wind deflector 222, which are sequentially arranged along the circumferential direction of the impeller 21; the sliding connecting plate 220 is an arc section which is matched with the spiral line plate 201 of the volute 20 in the circumferential direction, namely the shape of the sliding connecting plate 220 is matched with the spiral line plate 201 of the volute circumferential plate, the sliding connecting plate 220 and the spiral line plate 201 are located in the wind collecting area 2j in the circumferential direction in a superposed mode, specifically, the sliding connecting plate 220 is located on the outer side of the spiral line plate 201, and the sliding connecting plate 220 can also be located on the inner side of the spiral line plate 201 on the basis of meeting the circumferential sliding function and the assembling process requirements relative to the volute 20.
The volute tongue 221 is an arc section protruding from the end of the sliding connection plate 220 into the volute casing 20, that is, the center line of the centers of the volute tongue 221 and the sliding connection plate 220 is located on both sides of the circumferential sliding plate 22, the center line of the center of the sliding connection plate 220 is located in the cavity of the volute casing 20, the center line of the center of the volute tongue 221 is located outside the cavity of the volute casing 20, and the radius of the volute tongue 221 is equal to (0.03-0.06) D, where D represents the diameter of the impeller 21.
The air deflector 222 is a straight plate extending from the end of the volute tongue 221 to a direction away from the volute casing 20, preferably, in this embodiment, the air deflector 222 is disposed obliquely to the spiral line plate 201 side, and the plane of the air deflector 222 intersects with the volute casing circumferential plate located in the diffusion area 2k, that is, the plane of the air deflector 222 intersects with the straight plate 200 of the volute casing 20, and the included angle Θ between the two is 6 ℃ to 8 ℃, so that a diffuser structure can be formed at the exhaust port 20o of the centrifugal fan 2.
Further, the left and right sides of the circumferential sliding plate 22 are provided with the limiting plates 223 extending along the radial direction, the circumferential sliding plate 22 is clamped on the left and right sides of the volute 20 through the two limiting plates 223 to limit the displacement of the circumferential sliding plate 22 relative to the volute 20 along the axial direction of the impeller 21, and simultaneously, the circumferential sliding plate 22 slides relative to the volute 20 along the circumferential direction under the guiding action of the two limiting plates 223.
With continued reference to fig. 1-6, the centrifugal fan 2 further includes a drive mechanism for driving the circumferential slide plate 22 to circumferentially slide relative to the scroll 20 between a first limit position and a second limit position to adjust the opening size of the exhaust port 20 o.
In detail, the driving mechanism includes a support plate 23, a motor 24, and a push rod 25; the support plate 23 is directly or indirectly fixed to the scroll casing 20, and in this embodiment, the support plate 23 is indirectly fixed to the scroll casing 20. Specifically, the support plate 23 and the volute 20 are both fixedly connected to the housing 1, and certainly, on the basis of meeting the requirements of the function and the assembly process, the support plate 23 and the volute 20 can be directly fixedly connected, and the herein-mentioned fixed connection means that the support plate can be fixedly connected by a fastener such as a screw, or fixedly connected by riveting or welding. The casing of the motor 24 is fixedly connected to the support plate 23, the armature shaft of the motor is fixedly connected to one end of the push rod 25, and the other end of the push rod 25 is fixedly connected to the circumferential sliding plate 22, so that when the motor 24 is started, the armature shaft of the motor can drive the push rod 25 to rotate along with the push rod 25, and then the push rod 25 drives the circumferential sliding plate 22 to rotate relative to the volute 20, so as to adjust the opening degree of the exhaust port 20o of the volute 20.
Further, based on the structural definition of the scroll casing 20 and the circumferential sliding plate 22, in order to ensure that the circumferential sliding plate 22 and the scroll casing 20 are attached to each other during the sliding process, that is, no radial gap occurs between the two and the air leakage occurs at the gap, therefore, the armature shaft of the motor 24 is collinear with the center line of the center of the circumferential sliding plate 22, for this purpose, the push rod 25 includes a first rod section, a second rod section and a third rod section which are connected in sequence, wherein the first rod section and the third rod section are arranged in parallel and fixedly connected by the second rod section, the first rod section is collinear with the armature shaft of the motor 24 and fixedly connected with the armature shaft of the motor 24, the third rod section is fixedly connected with the circumferential sliding plate 22, and the length of the second rod section is exactly the distance from the connection point of the first rod section and the armature shaft to the connection point of the third rod section and the circumferential sliding plate 22.
It can be understood that, on the basis of satisfying the sliding function of the driving circumferential sliding plate 22 relative to the scroll casing 20 and the requirements of the machining and assembling processes, the other method can also be implemented, for example: the edge of the circumferential sliding plate 22 extends along the radial direction of the impeller 21 to form a connecting plate, the push rod 25 is a straight rod collinear with the armature shaft of the motor 24, the armature shaft of the motor 24 is fixedly connected at the first end part of the push rod 25, and the other end of the push rod is fixedly connected with the connecting plate, so that the push rod 25 is driven to drive the connecting plate to rotate when the armature shaft of the motor 24 rotates, and then the circumferential sliding plate 22 is driven to integrally rotate relative to the volute 20.
Referring to fig. 1 and 2, when the circumferential sliding plate 22 is located at the first limit position, the first radial clearance t between the volute tongue 221 and the impeller 21 is provided1Is smaller than a second radial clearance t between the volute tongue 221 and the impeller 21 when the circumferential sliding plate 22 is at the second limit position2。
Preferably, the first radial clearance amount t1D ═ 0.02 to 0.05, and a second radial clearance amount t2D is (0.1-0.15), wherein D represents the diameter of the impeller 21.
In summary, the volute tongue 221 of the centrifugal fan 2 of the present invention slides in the circumferential direction between the first limit position and the second limit position relative to the volute 20, and the opening degree of the exhaust port 20o of the centrifugal fan 2 can be adjusted, and then the air output of the centrifugal fan 2 is adjusted, that is, the larger the opening degree of the exhaust port 20o is, the larger the air output of the centrifugal fan 2 is, and vice versa. More importantly, compared with the prior art in which the radial gap between the volute tongue 221 and the impeller 21 is fixed, when the volute tongue 221 of the centrifugal fan 2 slides between the first limit position and the second limit position relative to the volute casing 20, the radial gap between the volute tongue 221 and the impeller 21 changes periodically, when the volute tongue 221 is located at the first limit position, the radial gap between the volute tongue 221 and the impeller 21 is minimum, when the volute tongue 221 is located at the deep tongue position, when the volute tongue 221 is located at the second limit position, the radial gap between the volute tongue 221 and the impeller 21 is maximum, when the volute tongue 221 is located at the shallow tongue position, the periodic change of the radial gap between the volute tongue 221 and the impeller 21 increases a disturbance to the air flow to form a vortex, a vortex ring air flow is formed at the exhaust port 20o of the volute casing 20, and the vortex air flow increases the air supply distance of the centrifugal fan 2.
Further, with continued reference to fig. 1 and 2, the air conditioner of the present invention further includes a partition plate 4, the partition plate 4 divides the housing into a first sub-housing 10 and a second sub-housing 11, the first sub-housing 10 is provided with an air inlet 1i, the second sub-housing 11 is provided with an air outlet 1o, the centrifugal fan 2 is located in the first sub-housing 10 and is fixedly connected with both the first sub-housing 10 and the partition plate 4, the partition plate 4 is provided with a through hole for communicating with the air outlet 20o of the scroll casing 20, and the heat exchanger 3 is installed in the second sub-housing 11. So set up, centrifugal fan 2 not only with casing fixed connection still with baffle 4 fixed connection, improved centrifugal fan 2's installation reliability. The term "fixedly connected" as used herein means fixedly connected by a fastener such as a screw, or fixedly connected by riveting or welding.
With continued reference to fig. 1, the air conditioner of the present invention further includes a current collector 5, the current collector 5 is fixedly installed at the air outlet 1o of the housing, and the current collector 5 is a cylinder with a gradually decreasing cross-sectional area along a direction perpendicular to the air flow direction. After the airflow passes through the current collector 5, the speed is increased, and the defect that the wind speed is not high due to small air volume when the volute tongue 221 is in a shallow tongue state is solved, so that the wind speed is still high even in the shallow tongue state, and the user experience is facilitated.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The utility model provides a centrifugal fan, includes spiral case and impeller, the impeller rotationally install in the spiral case, the gas vent has been seted up to the circumference of spiral case, its characterized in that, centrifugal fan still includes:
a circumferential sliding plate connected to the volute in a circumferentially slidable manner at a wind collecting area and having a volute tongue protruding into the volute at the exhaust port;
the driving mechanism is used for driving the circumferential sliding plate to circumferentially slide between a first limit position and a second limit position relative to the volute;
a first radial clearance t between the volute tongue and the impeller when the circumferential sliding plate is positioned at a first limit position1Is smaller than a second radial clearance t between the volute tongue and the impeller when the volute tongue is positioned at a second extreme position2。
2. The centrifugal fan of claim 1, wherein the first radial gap amount t1D is (0.02-0.05), wherein D represents the diameter of the impeller.
3. The centrifugal fan of claim 1, wherein the second radial gap amount t2(0.1-0.15) D, wherein D represents the diameter of the impeller.
4. The centrifugal fan according to any one of claims 1 to 3, wherein the circumferential sliding plate comprises a sliding connection plate, the volute tongue and a wind deflector which are sequentially arranged along the circumferential direction of the impeller;
the sliding connecting plate is an arc plate matched with the circumferential direction of the volute;
the volute tongue is an arc plate protruding from the end part of the sliding connecting plate to the inside of the volute;
the air deflector is a straight plate extending from the end part of the volute tongue to the direction far away from the volute casing.
5. The centrifugal fan according to claim 4, wherein the volute comprises a volute circumferential plate and two side plates, the volute circumferential plate comprises a straight plate and a spiral line plate, the spiral line plate is formed by extending end portions of the straight plate along the circumferential direction of the impeller according to a logarithmic spiral, the two side plates, the straight plate and the spiral line plate are assembled to enclose a cavity and the exhaust port, and the circumferential sliding plate is connected to the spiral line plate in a manner of sliding along the circumferential direction.
6. The centrifugal fan as claimed in claim 5, wherein the air deflection plates are inclined to the helical plate side, and the plane of the air deflection plates intersects the straight plate.
7. The centrifugal fan of any one of claims 1-3, wherein the drive mechanism comprises a motor, a support plate, and a push rod; one end of the push rod is fixedly connected with the circumferential sliding plate, the other end of the push rod is fixedly connected with an armature shaft of the motor, the axis of the armature shaft is collinear with the central line of the circumferential sliding plate, and the support plate is fixedly connected with the volute.
8. The centrifugal fan according to claim 6, wherein the number of the drive mechanisms is two, and the two drive mechanisms are respectively provided on both sides of the scroll casing in a left-right symmetrical manner with respect to the impeller.
9. An air conditioner comprising a housing and a centrifugal fan mounted in the housing, wherein the centrifugal fan is the centrifugal fan of any one of claims 1 to 8.
10. The air conditioner of claim 9, further comprising a partition dividing the housing into a first sub-housing and a second sub-housing, wherein the first sub-housing is provided with an air inlet, the second sub-housing is provided with an air outlet, the centrifugal fan is located in the first sub-housing and fixedly connected to the partition, the partition is provided with a through hole communicating with the air outlet of the volute, and the second sub-housing is provided with a heat exchanger.
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| CN202010618302.0A CN111911425B (en) | 2020-06-30 | 2020-06-30 | Centrifugal fan and air conditioner |
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| CN202010618302.0A CN111911425B (en) | 2020-06-30 | 2020-06-30 | Centrifugal fan and air conditioner |
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| CN111911425B CN111911425B (en) | 2024-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114030337A (en) * | 2021-12-14 | 2022-02-11 | 珠海格力电器股份有限公司 | Air conditioning box structure, air conditioner and vehicle with air conditioning box structure |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003042097A (en) * | 2001-07-31 | 2003-02-13 | Denso Corp | Centrifugal blower |
| US20040165984A1 (en) * | 2003-01-09 | 2004-08-26 | Toshinori Ochiai | Centrifugal air blower unit having movable portion |
| JP2008208798A (en) * | 2007-02-27 | 2008-09-11 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| CN102734866A (en) * | 2011-04-13 | 2012-10-17 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and operation control method thereof |
| MX2016000752A (en) * | 2015-01-20 | 2016-07-19 | Ford Global Tech Llc | Blower assembly for a vehicle. |
| EP3135803A1 (en) * | 2015-08-27 | 2017-03-01 | BSH Hausgeräte GmbH | Process air arrangement for a drying device and drying device |
| JP2017172519A (en) * | 2016-03-25 | 2017-09-28 | パナソニックＩｐマネジメント株式会社 | Air blower and air curtain including the same |
| CN210122958U (en) * | 2019-05-21 | 2020-03-03 | 海信（广东）空调有限公司 | Centrifugal fan and electric appliance |
| CN111075762A (en) * | 2019-12-11 | 2020-04-28 | 珠海格力电器股份有限公司 | Indoor unit and air conditioner with same |
-
2020
- 2020-06-30 CN CN202010618302.0A patent/CN111911425B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003042097A (en) * | 2001-07-31 | 2003-02-13 | Denso Corp | Centrifugal blower |
| US20040165984A1 (en) * | 2003-01-09 | 2004-08-26 | Toshinori Ochiai | Centrifugal air blower unit having movable portion |
| JP2008208798A (en) * | 2007-02-27 | 2008-09-11 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| CN102734866A (en) * | 2011-04-13 | 2012-10-17 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and operation control method thereof |
| MX2016000752A (en) * | 2015-01-20 | 2016-07-19 | Ford Global Tech Llc | Blower assembly for a vehicle. |
| EP3135803A1 (en) * | 2015-08-27 | 2017-03-01 | BSH Hausgeräte GmbH | Process air arrangement for a drying device and drying device |
| JP2017172519A (en) * | 2016-03-25 | 2017-09-28 | パナソニックＩｐマネジメント株式会社 | Air blower and air curtain including the same |
| CN210122958U (en) * | 2019-05-21 | 2020-03-03 | 海信（广东）空调有限公司 | Centrifugal fan and electric appliance |
| CN111075762A (en) * | 2019-12-11 | 2020-04-28 | 珠海格力电器股份有限公司 | Indoor unit and air conditioner with same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114030337A (en) * | 2021-12-14 | 2022-02-11 | 珠海格力电器股份有限公司 | Air conditioning box structure, air conditioner and vehicle with air conditioning box structure |
| CN114030337B (en) * | 2021-12-14 | 2023-08-18 | 珠海格力电器股份有限公司 | Air conditioner box structure, air conditioner and vehicle with air conditioner box structure |
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|---|---|
| CN111911425B (en) | 2024-07-09 |
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