CN210889447U - Centrifugal fan impeller and ventilator - Google Patents

Abstract

The utility model provides a centrifugal fan impeller and ventilation blower, centrifugal fan impeller are cylindricly, including rim plate and the blade of setting at rim plate terminal surface edge, the tip ring that the rim plate was kept away from to the blade establishes the structure of keeping out the wind, and the structure of keeping out the wind includes the first barrier plate that sets up towards the rim plate, and the contained angle between first barrier plate and the blade is within 90 degrees. The utility model provides a centrifugal fan impeller compares with prior art, has newly-increased the structure of keeping out the wind at the tip of blade, and the structure of keeping out the wind includes first barrier plate, sets up first barrier plate and junction slope for gaseous global exhaust path width from the impeller narrows down, and gaseous by the blade discharge back through the water conservancy diversion effect of first barrier plate prevent gaseous tip diffusion to the impeller. Therefore, the gas which is re-flowed after being discharged from the impeller is greatly reduced, and the efficiency of the rotation of the impeller is greatly improved.

Description

Centrifugal fan impeller and ventilator

Technical Field

The utility model belongs to the technical field of the ventilation blower, more specifically say, relate to a centrifugal fan impeller and ventilation blower.

Background

A centrifugal fan is a common ventilating device, and the centrifugal fan works on the principle that an impeller rotates along the axis thereof to suck air from the axial direction and discharge the air from the radial direction, negative pressure is formed inside the impeller during the rotation, and outside air is continuously sucked from the axial direction of the impeller.

The centrifugal fan further comprises a volute, and because the parts outside the impeller are high-pressure areas, the volute covers the impeller, air discharged from the impeller in the radial direction is easy to form secondary backflow from the axial direction of the impeller, and the performance of the centrifugal fan is affected, so that the gap between the axial direction of the impeller and the volute needs to be reduced from the performance perspective of the centrifugal fan. However, if the clearance between the axial direction of the impeller and the volute is too small, the assembly and disassembly between the impeller and the volute are easily affected, and the impeller and the guide ring in the volute are easily rubbed and abraded to cause interference.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centrifugal fan impeller and ventilation blower to solve the problem that the gas that flows out from the impeller that exists among the prior art takes place the secondary backward flow.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a centrifugal fan impeller, it is cylindric, be in including rim plate and setting the blade at rim plate terminal surface edge, the blade is kept away from the tip ring of rim plate establishes the structure of keeping out the wind, the structure of keeping out the wind includes the orientation the first barrier plate that the rim plate set up, just first barrier plate with contained angle between the blade is within 90 degrees.

Furthermore, the first blocking plate and the blades are perpendicular to each other, an additional blocking plate is further arranged on the first blocking plate, and the additional blocking plate and the first blocking plate are obliquely arranged.

Further, the wind shielding structure further comprises a second blocking plate for blocking the backflow of the gas flowing out of the blade to the end of the blade.

Further, the second stop plate is arranged back to the wheel disc, and the included angle range between the second stop plate and the blades exceeds 90 degrees.

Further, the included angle between the first blocking plate and the second blocking plate is within 90 degrees.

Further, the length of the second blocking plate is greater than that of the first blocking plate.

Further, the thickness of the first barrier plate and/or the second barrier plate continuously increases in a direction near the junction of the two.

Further, the junction of the first blocking plate and the second blocking plate is in smooth transition.

Another object of the utility model is to provide a ventilator, including the spiral case, still include above-mentioned centrifugal fan impeller, the centrifugal fan impeller sets up in the spiral case.

Furthermore, a guide ring is further arranged at the end part, facing the blades, in the volute, a gap is reserved between the second blocking plate and the guide ring, and the gap is not more than 10mm in the length direction of the blades.

The utility model provides a centrifugal fan impeller's beneficial effect lies in: compared with the prior art, the utility model discloses the structure of keeping out the wind has newly increased at the tip of blade, and the structure of keeping out the wind includes first barrier plate, sets up first barrier plate and junction slope for gaseous narrow from the global exhaust path width of impeller, gaseous by the blade discharge back through the water conservancy diversion effect prevention gas to the tip diffusion of impeller of first barrier plate. Therefore, the gas which is re-flowed after being discharged from the impeller is greatly reduced, and the efficiency of the rotation of the impeller is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a centrifugal fan impeller provided in an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural view of a centrifugal fan impeller provided in an embodiment of the present invention;

fig. 3 is a schematic front view of a centrifugal fan impeller provided in an embodiment of the present invention;

fig. 4 is a schematic sectional structure view of a ventilator provided in an embodiment of the present invention.

Wherein, in the drawings, the reference numerals are mainly as follows:

1. a wheel disc; 2. a blade;

3. a wind shielding structure; 31. a first barrier plate; 32. a second barrier plate;

4. a volute; 5. and (4) a flow guide ring.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to fig. 3, a centrifugal fan impeller according to an embodiment of the present invention will be described. The centrifugal fan impeller comprises a wheel disc 1 and blades 2, wherein the blades 2 are usually arranged at the edge position of the end face of the wheel disc 1. Therefore, the disk 1 and the blades 2 are assembled together to form a cylindrical shape. The end of the blade 2 is provided with a wind shielding structure 3 for solving the problems that will appear hereinafter. The wind shielding structure 3 includes a first blocking plate 31, and the first blocking plate 31 is provided along an end of the blade 2 so as to form a ring shape. The first blocking plate 31 is disposed toward the disk 1, and an included angle between the first blocking plate 31 and the vane 2 is an acute angle or a right angle. The theory of operation of traditional centrifugal fan impeller is, the following is called the impeller for short, and the impeller rotates along the axis of rim plate 1, and blade 2 rotates along with the impeller and makes the inside of impeller form the negative pressure, and gas enters into the inside of impeller from two terminal surfaces of impeller, the terminal surface of blade 2 promptly, and the effect of rethread blade 2 is followed the global discharge of impeller. Therefore, a high pressure region and a low pressure region are formed inside and outside the impeller, so that a phenomenon that part of gas flowing out of the inside of the impeller flows back to the inside of the impeller again from the end surfaces of the blades 2 occurs, and the working efficiency of the impeller is reduced.

The utility model provides a centrifugal fan impeller compares with prior art, has newly-increased structure 3 that keeps out the wind at the tip of blade 2, and structure 3 that keeps out the wind includes first barrier plate 31, sets up first barrier plate 31 and junction slope for gaseous global exhaust path width from the impeller narrows down, and gaseous by the blade 2 after discharging through the water conservancy diversion effect prevention gas of first barrier plate 31 to the tip diffusion of impeller. Therefore, the gas which is re-flowed after being discharged from the impeller is greatly reduced, and the efficiency of the rotation of the impeller is greatly improved.

Further, please refer to fig. 1 to fig. 3 together, as a specific embodiment of the centrifugal fan impeller provided by the present invention, the first blocking plate 31 and the blades 2 are disposed perpendicular to each other, an additional blocking plate is added on the first blocking plate 31, and the additional blocking plate and the first blocking plate 31 are disposed in an inclined manner instead of the above-mentioned first blocking plate 31. Specifically, the additional blocking plate may be arranged in a direction toward the wheel disc 1, so that the gas is firstly limited in flow direction by the first blocking plate 31 after flowing out from the impeller, and then is limited in flow direction for the second time by the additional blocking plate, so that the width of the gas outflow path is narrowed, which plays the same role as the above-mentioned obliquely arranged first blocking plate 31. And secondly, the additional blocking plate can be arranged towards the direction far away from the wheel disc 1, so that the gas is firstly limited by the first blocking plate 31 to flow after flowing out of the impeller, and then is guided by the additional blocking plate to flow, so that the gas which just flows out of the impeller is far away from the impeller as soon as possible. The two modes can realize the function of reducing backflow, can be selected according to actual conditions and requirements, or can be designed into other replaceable structures.

Further, please refer to fig. 1 to 3 together, as the utility model provides a centrifugal fan impeller's a specific implementation, structure 3 keeps out the wind still includes second barrier plate 32, first barrier plate 31 is connected to second barrier plate 32, first barrier plate 31 is after carrying out the first time to the gas that flows from the impeller, still possible a small amount of gas can flow back in the impeller, second barrier plate 32 has played the effect of second floor protective screen, carry out the second time to the gas that probably produces the backward flow and block, the inhibit action to producing the backward flow has further been improved, impeller pivoted efficiency has been improved.

Further, please refer to fig. 1 to fig. 3 together, as a specific embodiment of the centrifugal fan impeller provided by the present invention, the second blocking plate 32 is disposed opposite to the wheel disc 1, an included angle between the second blocking plate 32 and the blade 2 is an obtuse angle, a projection length of the second blocking plate 32 along a length direction of the blade 2 is smaller than an actual length of the second blocking plate 32, so as to reduce a possibility of collision or friction with other components when the impeller is installed. The safety of installation is improved.

Further, please refer to fig. 1 to fig. 3 together, as the utility model provides a centrifugal fan impeller's a specific implementation, the contained angle between first barrier plate 31 and the second barrier plate 32 is the acute angle for the angle interval between first barrier plate 31 and the second barrier plate 32 is unlikely to too big, after first barrier plate 31 carries out the first time to the gas that flows out from the impeller, second barrier plate 32 can carry out the second time to the escaped gas rapidly and block, has further promoted the effect that blocks.

Further, referring to fig. 1 to fig. 3, as a specific embodiment of the centrifugal fan impeller provided by the present invention, the length of the second blocking plate 32 is greater than the length of the first blocking plate 31, so as to further improve the blocking effect on the escaping gas.

Further, please refer to fig. 1 to fig. 3 together, as a specific embodiment of the centrifugal fan impeller provided by the present invention, the thickness of the first blocking plate 31 or the second blocking plate 32 near the joint is larger than the thickness far away from the joint, and the thickness of the first blocking plate 31 or the second blocking plate 32 is uniformly changed, which meets the design requirements of theoretical mechanics and material mechanics on the parts. The first blocking plate 31 and the second blocking plate 32 also play a role in strengthening the arrangement of the blade 2. The connection of the impeller is firmer and more stable.

Further, as the utility model provides a centrifugal fan impeller's a specific embodiment, first barrier plate 31 and second barrier plate 32's junction smooth transition for on the one hand, make first barrier plate 31 or second barrier plate 32 have the effect of better shear stress when receiving external force, on the other hand, prevent that the user from probably taking place by the phenomenon of fish tail when contacting first barrier plate 31 and second barrier plate 32, accord with ergonomic and humanized design.

Referring to fig. 4, the present invention further provides a ventilator, which includes a volute 4, and further includes the above-mentioned centrifugal fan impeller, hereinafter referred to as impeller, and the impeller is disposed in the volute 4.

Further, please refer to fig. 4, as a specific embodiment of the ventilator provided by the present invention, a flow guiding ring 5 is further disposed on the spiral case 4, and the flow guiding ring 5 is used for guiding the external air into the impeller. The second blocking plate 32 and the deflector ring 5 have a gap therebetween, and the above-mentioned arrangement of the second blocking plate 32 is also to prevent the second blocking plate 32 and the deflector ring 5 from interfering when being assembled and disassembled. In the processing of the present embodiment, the gap between the second blocking plate 32 and the guide ring 5 along the length direction of the blade 2 is 10mm, and of course, in other embodiments, the actual gap size range may be selected according to actual conditions and requirements.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. Centrifugal fan impeller is cylindricly, is including rim plate and setting the blade at rim plate terminal surface edge, its characterized in that: the blade is kept away from the tip ring of rim plate establishes structure of keeping out the wind, structure of keeping out the wind includes the orientation the first barrier plate that the rim plate set up, just first barrier plate with the contained angle between the blade is within 90 degrees.

2. The centrifugal fan impeller of claim 1, wherein: the first blocking plate is perpendicular to the blades, an additional blocking plate is further arranged on the first blocking plate, and the additional blocking plate and the first blocking plate are obliquely arranged.

3. The centrifugal fan impeller of claim 1, wherein: the wind shielding structure further comprises a second blocking plate for blocking the backflow of the gas flowing out of the blade to the end of the blade.

4. A centrifugal fan impeller according to claim 3, wherein: the second blocks the board and dorsad the rim plate setting, just the second blocks the board with the contained angle scope between the blade exceeds 90 degrees.

5. A centrifugal fan impeller according to claim 3, wherein: the included angle between the first blocking plate and the second blocking plate is within 90 degrees.

6. A centrifugal fan impeller according to claim 3, wherein: the length of the second stop plate is greater than that of the first stop plate.

7. A centrifugal fan impeller according to claim 3, wherein: the thickness of the first barrier plate and/or the second barrier plate continuously increases in a direction near the junction of the two.

8. A centrifugal fan impeller according to claim 3, wherein: the junction of the first stop plate and the second stop plate is in smooth transition.

9. Ventilator, including the spiral case, its characterized in that: further comprising the centrifugal fan wheel of any of claims 1-8 disposed within the volute.

10. A ventilator as claimed in claim 9, wherein: the end part of the volute facing the blade is also provided with a guide ring, a gap is reserved between the second blocking plate and the guide ring, and the gap is not more than 10mm in the length direction of the blade.

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