CN112065740B - Centrifugal fan - Google Patents
Centrifugal fan Download PDFInfo
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- CN112065740B CN112065740B CN201910502455.6A CN201910502455A CN112065740B CN 112065740 B CN112065740 B CN 112065740B CN 201910502455 A CN201910502455 A CN 201910502455A CN 112065740 B CN112065740 B CN 112065740B
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a centrifugal fan, comprising: the volute comprises a front plate, a rear plate and a surrounding plate, wherein the molded line of the surrounding plate comprises an initial straight line section, a transition rounding section, a first spiral line section, a second spiral line section, a third spiral line section, a fourth spiral line section, a fifth spiral line section, a sixth spiral line section and a final straight line section which are connected in a smooth transition mode in sequence, and the first spiral line section, the second spiral line section, the third spiral line section, the fourth spiral line section, the fifth spiral line section and the sixth spiral line section are arranged concentrically; and an impeller disposed within the volute. The air channel flow field in the volute of the centrifugal fan is improved, and the performance of the centrifugal fan is improved.
Description
Technical Field
The invention relates to the technical field of ventilation equipment, in particular to a centrifugal fan.
Background
At present, a multi-wing centrifugal fan adopted by a range hood or an integrated stove performs air suction and exhaust. The volute curve of the centrifugal fan commonly used in the market at present is formed by adopting an approximate spiral line or a plurality of sections of circular arcs with different diameters, and due to the fact that the design theory is imperfect and the matching of the impeller is not coordinated, the flow in each flow channel in the axial direction of the impeller is not uniform, the wind pressure and the wind volume of a fan system are small, and the requirement of people cannot be met.
Disclosure of Invention
It is an object of the present invention to provide a centrifugal fan with an improved flow field of the air passage in the volute.
A further purpose of the invention is to ensure that the flow condition of the air channel flow field in the volute is good and no vortex exists.
In particular, the present invention provides a centrifugal fan comprising:
the volute comprises a front plate, a rear plate and a surrounding plate, wherein the molded line of the surrounding plate comprises an initial straight line section, a transition rounding section, a first spiral line section, a second spiral line section, a third spiral line section, a fourth spiral line section, a fifth spiral line section, a sixth spiral line section and a termination straight line section which are connected in a smooth transition mode in sequence, and the first spiral line section, the second spiral line section, the third spiral line section, the fourth spiral line section, the fifth spiral line section and the sixth spiral line section are arranged concentrically; and
the impeller is arranged in the volute.
Optionally, the distances between points on the first spiral line segment, the second spiral line segment, the third spiral line segment, the fourth spiral line segment, the fifth spiral line segment, and the sixth spiral line segment and the center of the circle gradually increase.
Optionally, the spiral equation of the first spiral segment is: rho1＝ρ0+k×ψ1，
In the formula, ρ0The distance between the starting point of the first spiral line segment and the center of the circle
Is calculated to obtain wherein
The diameter of the impeller is regarded as delta is the distance between the starting point of the first spiral line segment and the impeller; k satisfies
ψ1The rotation angle is the rotation angle when the connection line of the starting point and the circle center of the first spiral line segment is taken as the reference line.
Optionally, an included angle α between a connecting line of the starting point and the center of the first spiral line segment and the vertical direction satisfies 13 ° or more and 17 ° or less.
Optionally, the spiral equations of the second spiral segment, the third spiral segment, the fourth spiral segment, the fifth spiral segment, and the sixth spiral segment are: rhon＝ρm+k’×ψn(ii) a Wherein n is selected from 2, 3, 4, 5 or 6, m is selected from 1, 2, 3, 4 or 5; rhomIs the distance between the end point of the mth spiral line segment and the center of the circle; k ' satisfies k ' > k, and the larger n, the larger k '; psinThe rotation angle is the reference line of the line between the starting point and the center of the n-th spiral line.
Optionally, the rotation angle ψ of the first helical line segment1Maximum of 55 ° ± 10 °;
rotation angle psi of the second spiral segment2Maximum of 65 ° ± 10 °;
rotation angle psi of third spiral segment3Maximum of 30 ° ± 5 °;
rotation angle psi of the fourth spiral segment4Maximum of 55 ° ± 10 °;
rotation angle psi of fifth spiral segment5Maximum of 65 ° ± 10 °;
rotation angle psi of sixth helical segment6The maximum value of (c) is 65 ° ± 10 °.
Alternatively, the diameter of the impeller
Satisfy the requirement of
The distance delta between the starting point of the first spiral line segment and the impeller meets the requirement that delta is more than or equal to 8mm and less than or equal to 20 mm;
the helix equation for the first helix segment is: rho1＝ρ0+0.30×ψ1；
The helix equation for the second helix segment is: rho2＝ρ1+0.32×ψ2；
The helix equation for the third helix segment is: rho3＝ρ2+0.33×ψ3；
The helix equation for the fourth helix segment is: rho4＝ρ3+0.35×ψ4；
The spiral equation of the fifth spiral segment is: rho5＝ρ4+0.37×ψ5；
The spiral equation of the sixth spiral segment is: rho6＝ρ5+0.39×ψ6。
Optionally, the initial straight line segment is obliquely arranged and forms an acute angle with the vertical direction;
the termination straight line section is obliquely arranged and forms an acute angle with the vertical direction;
the extension lines of the starting straight line segment and the ending straight line segment are intersected, and the included angle theta is more than or equal to 15 degrees and less than or equal to 21 degrees.
Optionally, an included angle between the initial straight line segment and the vertical direction is 25 ° ± 3 °;
the angle between the terminating straight line segment and the vertical direction is 7 +/-3 degrees.
Optionally, the front plate is provided with an air inlet of the centrifugal fan, and an air inlet ring is further arranged at the air inlet;
the back plate is provided with a motor mounting hole, and a motor of the centrifugal fan is fixed on the back plate.
The molded line of the enclosing plate of the volute of the centrifugal fan comprises an initial straight line section, a transition reverse circle section, a first spiral line section, a second spiral line section, a third spiral line section, a fourth spiral line section, a fifth spiral line section, a sixth spiral line section and a termination straight line section which are connected in sequence in a smooth transition mode, and the first spiral line section, the second spiral line section, the third spiral line section, the fourth spiral line section, the fifth spiral line section and the sixth spiral line section are arranged concentrically, so that an air channel flow field in the volute is improved, and the performance of the centrifugal fan is improved.
Furthermore, according to the diameter and the blade line type of the impeller, the centrifugal fan is a volute curve formed by different curvatures and spiral line sections, the performance of the centrifugal fan can be improved, the phenomenon of uneven flow in each flow channel is improved, the maximum air volume lifting rate can reach 4.12%, the maximum static pressure lifting rate can reach 13.59%, and the static pressure lifting rate in the specified air volume can reach 11.67%.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a perspective view of a centrifugal fan according to an embodiment of the present invention.
Fig. 2 is another perspective view of the centrifugal fan shown in fig. 1.
Fig. 3 is a further perspective view of the centrifugal fan shown in fig. 1.
Figure 4 is a schematic view of the impeller and shroud of the centrifugal fan shown in figure 1.
Figure 5 is another schematic view of the impeller and shroud of the centrifugal fan shown in figure 4.
Fig. 6 is a partially enlarged schematic view of the centrifugal fan shown in fig. 5.
FIG. 7 is a fluid simulation analysis diagram of a centrifugal fan in accordance with one embodiment of the present invention.
Detailed Description
Fig. 1 is a perspective view of a centrifugal fan 100 according to an embodiment of the present invention. Fig. 2 is another perspective view of centrifugal fan 100 shown in fig. 1. Fig. 3 is a further perspective view of centrifugal fan 100 shown in fig. 1. Fig. 4 is a schematic view of impeller 300 and shroud 203 of centrifugal fan 100 shown in fig. 1. The centrifugal fan 100 of the embodiment of the present invention includes a volute 200 having an air inlet 101 and an air outlet 102, an impeller 300 disposed in the volute 200, an air inlet ring 500 disposed on the air inlet 101, and a motor 400 for driving the impeller 300 to rotate. The volute 200 includes a front plate 201, a shroud 203 and a back plate 202. The coaming 203 is arranged between the front plate 201 and the rear plate 202, the molded line of the coaming 203 comprises an initial straight line segment JI, a transition rounding segment IH, a first spiral line segment HG, a second spiral line segment GF, a third spiral line segment FE, a fourth spiral line segment ED, a fifth spiral line segment DC, a sixth spiral line segment CB and a termination straight line segment BA which are connected in sequence in a smooth transition mode, and the first spiral line segment HG, the second spiral line segment GF, the third spiral line segment FE, the fourth spiral line segment ED, the fifth spiral line segment DC and the sixth spiral line segment CB are arranged concentrically. The shroud 203 connects the front plate 201 and the rear plate 202, and the upper and lower ends are respectively connected with the outer edges of the front plate 201 and the rear plate 202 by welding, and the upper part forms the air outlet 102. A flange 103 is welded at the air outlet 102. The intake vent 101 is provided at the center of the front plate 201. The air inlet ring 500 is disposed around the air inlet 101 and fixed on the front plate 201. The rear plate 202 is provided with a motor mounting hole, and the motor 400 is fixed to the rear plate 202 by a screw.
The distances between the points on the first spiral segment HG, the second spiral segment GF, the third spiral segment FE, the fourth spiral segment ED, the fifth spiral segment DC and the sixth spiral segment CB of the shroud 203 of the centrifugal fan 100 according to the embodiment of the present invention and the center of the circle gradually increase, and are gradually expanding curves.
In some embodiments, the helix equation of the first helix segment HG of the shroud 203 of the centrifugal fan 100 of embodiments of the present invention is: rho1＝ρ0+k×ψ1. In the formula, ρ0Is the distance between the starting point of the first spiral segment HG and the center of the circle
Is calculated to obtain wherein
δ is the distance from the starting point of the first spiral line segment HG to the impeller 300, which is the diameter of the impeller 300; k satisfies
ψ1The rotation angle is the reference line when the connection line between the start point and the center of the first spiral line segment HG is used. For example, when the diameter of the impeller 300 is
When the thickness is 200mm, the value range of the coefficient k is 0.2-0.32; when diameter of impeller 300
The value of the coefficient k is in the range of 0.3-0.48 when the diameter is 300 mm.
The spiral line equations of the second spiral line GF, the third spiral line FE, the fourth spiral line ED, the fifth spiral line DC and the sixth spiral line CB in the embodiment of the present invention are: rhon＝ρm+k’×ψn(ii) a Wherein n is selected from 2, 3, 4, 5 or 6, m is selected from 1, 2, 3, 4 or 5; rhomIs the distance between the end point of the mth spiral line segment and the center of the circle; k ' satisfies k ' > k, and the larger n, the larger k '; psinThe rotation angle is the reference line of the line between the starting point and the center of the n-th spiral line.
Fig. 5 is another schematic view of impeller 300 and shroud 203 of centrifugal fan 100 shown in fig. 4. Fig. 6 is a partially enlarged schematic view of the centrifugal fan 100 shown in fig. 5. The molded line of the shroud 203 of the centrifugal fan 100 according to the embodiment of the present invention is composed of two straight line segments, a transition segment and six concentric spiral line segments, and includes an initial straight line segment JI, a transition rounding segment IH, a first spiral line segment HG, a second spiral line segment GF, a third spiral line segment FE, a fourth spiral line segment ED, a fifth spiral line segment DC, a sixth spiral line segment CB, and an end straight line segment BA. The center of the impeller 300 is assumed to be point O.
Length L of starting straight line segment JI1According to the diameter of the impeller 300
Different from each other. Length L1The optimal value range of (1) is 60-100mm, and the diameter of the impeller 300 is the same as that of the impeller
The larger, the length L1The larger. For example, when the diameter of the impeller 300 is
At 200mm, length L1May be 60 mm; when diameter of impeller 300
Length L of 300mm1And may be 70 mm.
The transition rounding IH is a transition connecting the point I of the starting straight line segment JI and the point H of the first spiral line segment HG, and is rounded.
The spiral equation of the first spiral segment HG is: rho1＝ρ0+0.30×ψ1. In the formula, the distance rho from the point H to the point O0：
δ is the distance between the starting point H of the first spiral line segment HG and the impeller 300; psi1The rotation angle is based on the OH line. Preferably, 8 mm. ltoreq. delta. ltoreq.20 mm. The included angle between the OH line and the OG line is 55 degrees +/-10 degrees. That is to say psi1The value range of (A) is 0-45 degrees or 0-65 degrees. The angle alpha between the OH line and the vertical is 13-17 degrees, preferably 15 degrees. In fig. 4, the OP line is shown for clarity of showing the meaning of α.
The second spiral segment GF and the first spiral segment HG are tangent at point G. The helix equation for the second helix segment GF is: rho2＝ρ1+0.32×ψ2(ii) a In the formula, #2The rotation angle is based on the OG line. The included angle GOF between the OG line and the OF line is 65 degrees +/-10 degrees. That is to say psi2The value range of (A) is 0-55 degrees or 0-75 degrees.
The third spiral segment FE and the second spiral segment GF are tangent at point F. The spiral equation for the third spiral segment FE is: rho3＝ρ2+0.33×ψ3(ii) a In the formula, #3The rotation angle is based on the OF line. The included angle between the OF line and the OE line is 30 degrees +/-5 degrees. That is to say psi3The value range of (A) is 0-25 degrees or 0-35 degrees.
The fourth spiral segment ED and the third spiral segment FE are tangent at point E. The helix equation for the fourth helix segment ED is: rho4＝ρ3+0.35×ψ4(ii) a In the formula, #4The rotation angle is based on the OE line. The included angle between the OE line and the OD line is 55 degrees +/-10 degrees. That is to say psi4The value range of (A) is 0-45 degrees or 0-65 degrees.
The fifth spiral segment DC and the fourth spiral segment ED are tangent at point D. The helix equation for the fifth helix segment DC is: rho5＝ρ4+0.37×ψ5(ii) a In the formula, #5The rotation angle is based on the OD line. The included angle between the OC line and the OD line is 65 degrees +/-10 degrees. That is to say psi5The value range of (A) is 0-55 degrees or 0-75 degrees.
The sixth and fifth spiral segments CB and DC are tangent at point C. The spiral equation of the sixth spiral segment CB is: rho6＝ρ5+0.39×ψ6(ii) a In the formula, #6The rotation angle is based on the OC line. The included angle COB between the OB line and the OC line is 65 degrees +/-10 degrees. That is to say psi6The value range of (A) is 0-55 degrees or 0-75 degrees.
Length L of terminal straight line segment BA2Length L from starting straight line segment JI1As such, are all the diameters of the impeller 300
But the length L of the terminating straight line segment BA2Length L from starting straight line segment JI1The values of both are not the same. Length L2The optimal value range of (1) is 60-100mm, and the diameter of the impeller 300 is the same as that of the impeller
The larger, the length L2The larger. For example, when the diameter of the impeller 300 is
At 200mm, length L2May be 80 mm; when diameter of impeller 300
Length L of 300mm2May be 100 mm. The extension of the initial straight line segment JI makes an acute angle with the vertical center line OP. The extension line of the ending straight line segment BA and the vertical center line OP also form an acute angle, and the angle is smaller than the included angle between the extension line of the starting straight line segment JI and the vertical center line OP. The included angle theta between the terminating straight line segment BA and the starting straight line segment JI is in the range of 18 degrees +/-3 degrees. For example, the extension of the starting straight line segment JI makes an angle of 25 ° with the vertical center line OP, and the extension of the terminating straight line segment BA makes an angle of 7 ° with the vertical center line OP.
Fig. 7 is a fluid simulation analysis diagram of the centrifugal fan 100 according to the embodiment of the present invention. As can be seen from the figure, the flow of the air channel flow field in the volute 200 of the centrifugal fan 100 according to the embodiment of the present invention is good and has no vortex.
Table 1 is a table of performance test results of the centrifugal fan 100 of the embodiment of the present invention and the volute 200 of the existing centrifugal fan.
TABLE 1
| Maximum air volume | Maximum static pressure | Static pressure at a predetermined air flow | |
| Comparative example | 15.53 | 461.60 | 359.04 |
| Examples of the invention | 16.17 | 524.32 | 400.94 |
| Rate of increase | 4.12％ | 13.59％ | 11.67％ |
Therefore, the centrifugal fan 100 of the embodiment of the invention greatly improves the flow field of the air duct in the volute 200, improves the performance of the air duct, and has the maximum air volume lifting rate of 4.12%, the maximum static pressure lifting rate of 13.59% and the static pressure lifting rate of 11.67% when the air volume is regulated.
The molded line of the coaming 203 of the volute 200 of the centrifugal fan 100 in the embodiment of the invention is formed by sequentially and smoothly transitionally connecting an initial straight line segment JI, a transition reverse circle segment IH, a first spiral line segment HG, a second spiral line segment GF, a third spiral line segment FE, a fourth spiral line segment ED, a fifth spiral line segment DC, a sixth spiral line segment CB and a termination straight line segment BA, and the first spiral line segment HG, the second spiral line segment GF, the third spiral line segment FE, the fourth spiral line segment ED, the fifth spiral line segment DC and the sixth spiral line segment CB are concentrically arranged, so that the air duct flow field in the volute 200 is improved, and the performance of the centrifugal fan 100 is improved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A centrifugal fan, comprising:
the volute comprises a front plate, a rear plate and a surrounding plate, wherein the molded line of the surrounding plate comprises an initial straight line section, a transition rounding section, a first spiral line section, a second spiral line section, a third spiral line section, a fourth spiral line section, a fifth spiral line section, a sixth spiral line section and a final straight line section which are connected in a smooth transition mode in sequence, and the first spiral line section, the second spiral line section, the third spiral line section, the fourth spiral line section, the fifth spiral line section and the sixth spiral line section are arranged concentrically; and
an impeller disposed within the volute; wherein
The distances between points on the first spiral line segment, the second spiral line segment, the third spiral line segment, the fourth spiral line segment, the fifth spiral line segment and the sixth spiral line segment and the circle center are gradually increased; and is
The spiral equation of the first spiral segment is: rho1＝ρ0+k×ψ1，
In the formula, ρ0The distance between the starting point and the center of the first spiral line segment is calculated according to
Is calculated to obtain wherein
The diameter of the impeller is regarded as delta, and delta is the distance between the starting point of the first spiral line segment and the impeller; k satisfies
ψ1The rotation angle is the reference line which is the connecting line of the starting point and the circle center of the first spiral line segment; rho1、ρ0、
Delta has the unit of mm, psi1The unit of (c) is degree.
2. The centrifugal fan of claim 1,
the included angle alpha between the connecting line of the starting point and the circle center of the first spiral line segment and the vertical direction meets the condition that alpha is more than or equal to 13 degrees and less than or equal to 17 degrees.
3. The centrifugal fan of claim 1,
the spiral line equations of the second spiral line segment, the third spiral line segment, the fourth spiral line segment, the fifth spiral line segment and the sixth spiral line segment are as follows: rhon＝ρm+k′×ψn；
Wherein n is selected from 2, 3, 4, 5 or 6, m is selected from 1, 2, 3, 4 or 5; rhomIs the distance between the end point of the mth spiral line segment and the center of the circle; k ' satisfies k ' > k, and the larger n, the larger k '; psinThe rotation angle is the reference line which is the connecting line of the starting point and the circle center of the nth spiral line segment; rhon、ρmIn units of mm,. psinThe unit of (c) is degree.
4. The centrifugal fan of claim 3,
the rotation angle psi of the first spiral segment1Maximum of 55 ° ± 10 °;
the rotation angle psi of the second spiral segment2Maximum of 65 ° ± 10 °;
the rotation angle psi of the third spiral segment3Maximum of 30 ° ± 5 °;
the rotation angle psi of the fourth spiral segment4Maximum of 55 ° ± 10 °;
the rotation angle psi of the fifth spiral segment5Maximum of 65 ° ± 10 °;
the rotation angle psi of the sixth spiral segment6The maximum value of (c) is 65 ° ± 10 °.
5. The centrifugal fan of claim 4,
diameter of the impeller
Satisfy the requirement of
The distance delta between the starting point of the first spiral line segment and the impeller is more than or equal to 8mm and less than or equal to 20 mm;
the spiral equation of the first spiral segment is: rho1＝ρ0+0.30×ψ1；
The spiral equation of the second spiral line segment is as follows: rho2＝ρ1+0.32×ψ2；
The spiral equation of the third spiral line segment is as follows: rho3＝ρ2+0.33×ψ3；
The spiral equation of the fourth spiral line segment is as follows: rho4＝ρ3+0.35×ψ4；
The spiral equation of the fifth spiral line segment is as follows: rho5＝ρ4+0.37×ψ5；
The spiral equation of the sixth spiral line segment is: rho6＝ρ5+0.39×ψ6。
6. The centrifugal fan of claim 1,
the starting straight line segment is obliquely arranged and forms an acute angle with the vertical direction;
the termination straight line section is obliquely arranged and forms an acute angle with the vertical direction;
the extension lines of the starting straight line segment and the ending straight line segment are intersected, and the included angle theta is larger than or equal to 15 degrees and smaller than or equal to 21 degrees.
7. The centrifugal fan of claim 6,
the included angle between the starting straight line segment and the vertical direction is 25 +/-3 degrees;
the included angle between the termination straight line segment and the vertical direction is 7 +/-3 degrees.
8. The centrifugal fan of claim 1,
the front plate is provided with an air inlet of the centrifugal fan, and an air inlet ring is arranged at the air inlet;
the rear plate is provided with a motor mounting hole, and a motor of the centrifugal fan is fixed on the rear plate.
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| CN201910502455.6A CN112065740B (en) | 2019-06-11 | 2019-06-11 | Centrifugal fan |
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|---|---|---|---|
| CN201910502455.6A CN112065740B (en) | 2019-06-11 | 2019-06-11 | Centrifugal fan |
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| CN112065740B true CN112065740B (en) | 2022-03-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1260563A1 (en) * | 1984-12-17 | 1986-09-30 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Атомного И Энергетического Насосостроения | Centrifugal pump tap outlet |
| KR20010011433A (en) * | 1999-07-28 | 2001-02-15 | 윤종용 | centrifugal fan |
| CN102865248A (en) * | 2011-07-06 | 2013-01-09 | 珠海格力电器股份有限公司 | Air conditioner volute and air conditioner provided with same |
| CN104847699A (en) * | 2015-05-19 | 2015-08-19 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
-
2019
- 2019-06-11 CN CN201910502455.6A patent/CN112065740B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1260563A1 (en) * | 1984-12-17 | 1986-09-30 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Атомного И Энергетического Насосостроения | Centrifugal pump tap outlet |
| KR20010011433A (en) * | 1999-07-28 | 2001-02-15 | 윤종용 | centrifugal fan |
| CN102865248A (en) * | 2011-07-06 | 2013-01-09 | 珠海格力电器股份有限公司 | Air conditioner volute and air conditioner provided with same |
| CN104847699A (en) * | 2015-05-19 | 2015-08-19 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
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| Publication number | Publication date |
|---|---|
| CN112065740A (en) | 2020-12-11 |
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Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant after: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Applicant after: Haier Zhijia Co., Ltd Address before: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant before: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Applicant before: Haier Limited by Share Ltd, Qingdao |