CN211599088U

CN211599088U - Partial flow passage centrifugal impeller

Info

Publication number: CN211599088U
Application number: CN201921944990.9U
Authority: CN
Inventors: 石雪松; 张义云
Original assignee: Jianlong Haining Machinery Industry Co ltd
Current assignee: Jianlong Haining Machinery Industry Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-09-29
Anticipated expiration: 2029-11-12

Abstract

The utility model discloses a local runner centrifugal impeller, establish the wheel cap in the blade outside including rim plate, a plurality of blades of fixing on the rim plate and lid, the wheel cap with the air intake that link up is seted up at the rim plate middle part, the blade sets up in the air intake inboard, at each the outer circumferencial direction of blade is provided with a current-limiting blade, current-limiting blade and the adjacent blade formation runner of keeping away from current-limiting blade. The utility model discloses a local runner centrifugal impeller through the position of short blade at the circumferencial direction, adjusts impeller export flow area, controls the diffusion degree in the impeller runner to improve windThe impeller efficiency is high, and the aim of saving energy is fulfilled; while the shroud of the impeller is a parallel shroud, i.e. the inlet width b₁And outlet width b₂The same, both improved fan wheel efficiency, reduced fan manufacturing cost again.

Description

Partial flow passage centrifugal impeller

Technical Field

The utility model relates to a centrifugal fan technical field especially relates to a local runner centrifugal impeller.

Background

The centrifugal fan impeller produced by the existing fan enterprises is shown in figures 1 and 2 and comprises a wheelCover 1, wheel disc 2 and blades 3, for a high pressure low flow fan, due to its inlet diameter D₁Specific impeller outer diameter D₂Much smaller. If the width b of the inlet of the centrifugal impeller is large₁And an outlet b₂The same, the outlet area A of the centrifugal impeller flow passage₂(＝πD₂b₂) Specific flow channel impeller inlet area A₁(＝πD₁b₁) The flow diffusion degree in the impeller flow channel is large, so that the separation is generated by the air flow in the impeller flow channel, and the efficiency of the impeller is reduced.

For the above case, the inlet width b of the centrifugal impeller is increased₁To adjust and reduce the degree of diffusion of the impeller flowpath flow, as shown in figure 1. Due to the width b of the impeller inlet₁Greater than the width b of the impeller outlet₂Such impeller covers are tapered covers, which also results in increased impeller tooling costs.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a local flow channel centrifugal impeller, which adjusts the flow channel area of the impeller outlet by adjusting the position of the flow-limiting blade in the circumferential direction, and further controls the diffusion degree in the impeller flow channel, thereby improving the efficiency of the fan impeller and achieving the purpose of energy saving; while the width b of the inlet of the impeller₁And outlet width b₂The same, both improved fan wheel efficiency, reduced fan manufacturing cost again.

The technical scheme of the utility model as follows:

the utility model provides a local runner centrifugal impeller, includes the rim plate, fixes a plurality of blades on the rim plate and covers the wheel cap of establishing in the blade outside, the wheel cap with the rim plate middle part is seted up the air intake that link up, the blade sets up in the air intake inboard, at each the outer circumferencial direction of blade is provided with a current-limiting blade, current-limiting blade and the adjacent blade of keeping away from current-limiting blade form the runner.

Further, the blade is a binary blade or a ternary blade.

Further, the binary blade is a backward-curved blade, a radial blade or a forward-curved blade.

Further, the shape of the flow restricting blades preferably matches the profile of the shape of the adjacent blades remote from the flow restricting blades.

Further, the flow limiting blades are short blades.

Further, the flow limiting blades are long blades.

Further, the wheel cover is an equal-width parallel wheel cover.

The utility model provides a beneficial effect: the sudden expansion degree of the flow channel can be reduced by arranging the flow-limiting blades, the outlet area of the impeller is limited, and further the reduction of the fan efficiency caused by the sudden expansion of the flow channel is avoided;

on the premise of not improving the existing processing conditions and process level, the local flow channel impeller can be conveniently applied by domestic fan manufacturers, and a conical wheel cover of a high-pressure low-flow fan is changed into an equal-width parallel wheel cover, namely b₁＝b₂The efficiency of the fan impeller is improved, and the manufacturing cost of the fan is reduced. The flow-limiting blades can also be used for adjusting the area of the outlet flow channel of the impeller through the position change of the flow-limiting blades in the circumferential direction, so that the diffusion degree in the flow channel of the impeller is controlled, the efficiency of the fan impeller is improved, and the purpose of energy conservation is achieved.

The utility model discloses can be applied to traditional binary blade centrifugal impeller, including backward curved blade, radial blade and antecurvature blade, also can be applied to the centrifugal impeller of ternary blade.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a conventional centrifugal fan impeller structure (backward curved blades);

FIG. 2 is a schematic side view of the impeller of FIG. 1;

fig. 3 is a schematic structural view of the centrifugal fan impeller of the present invention (short blade case, backward bent blade);

FIG. 4 is a side view of the centrifugal impeller of FIG. 3;

FIG. 5 is a schematic perspective view of the centrifugal impeller of FIG. 3 (the cover plate is semi-transparent and is not transparent);

fig. 6 is a schematic structural view of the centrifugal fan impeller of the present invention (full blade case, backward curved blade);

FIG. 7 is a side view of the centrifugal impeller of FIG. 6;

fig. 8 is a schematic structural view of the centrifugal fan impeller of the present invention (radial blades);

FIG. 9 is a side view of the centrifugal impeller of FIG. 8;

fig. 10 is a schematic structural view of the centrifugal fan impeller of the present invention (forward-bent blades);

fig. 11 is a side view of the centrifugal impeller of fig. 10.

In the figure: 1-wheel cover; 2-a wheel disc; 3-a blade; 4-a flow restricting vane; 5-flow channel.

Note: except for fig. 5, the sectional structure of the blade is a schematic view with the cover plate omitted.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 2-5, a centrifugal impeller with local flow channels comprises a wheel disc 2, a plurality of blades 3 fixed on the wheel disc in a welding mode and a wheel cover 1 covering the outer sides of the blades 3, wherein the middle parts of the wheel cover 1 and the wheel disc 2 are provided with a through air inlet, the blades 3 are arranged on the inner side of the air inlet (the end parts of the blades 3 are arranged at the edge of the air inlet), a flow limiting blade 4 is arranged in the outer circumferential direction of each blade 3, the axial height of the flow limiting blade 4 is the same as that of the blade 3, the flow channel 5 is formed by the flow limiting blade 4 and the adjacent blade 3 far away from the flow limiting blade 4, the sudden expansion degree of the flow channel 5 can be reduced by arranging the flow limiting blade; the shape of the restrictor blades 4 is preferably matched to the profile of the shape of the adjacent blades 3 remote from the restrictor blades 4 (parallel arrangement), which, in addition to the blades 3, limits the degree of diffusion of the flow channel 5, so that the degree of diffusion of the flow channel 5 is more uniform.

The inlet width b of the impeller is enabled due to the arrangement of the flow-limiting blades 4₁And the width b of the outlet₂Similarly, the original conical wheel cover is changed into the equal-width parallel wheel cover, so that the manufacturing cost of the fan is reduced.

In the present embodiment, the blade 3 is a backward curved blade, and the restrictor blade 4 is a short blade (i.e., the starting end of the restrictor blade 4 is not the root of the blade 3).

Referring to fig. 6 and 7, the blade 3 is also a backward curved blade, in which case the restrictor blade 4 is a long blade, in which case the initial end of the restrictor blade is the root of the blade 3.

Referring to fig. 8, 9 and 10, 11, the case where the restrictor blade 4 is a short blade among the radial blade and the forward curved blade is illustrated, respectively.

In addition, the centrifugal impeller can also be applied to a centrifugal impeller with three-element blades.

In the present application, the structure and the connection relation which are not described in detail are the prior art, the structure and the principle thereof are known in the prior art, and the fixing and the shape of the wheel cover 1 and the blade 3 are the prior conventional art, and are not described herein again.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a local runner centrifugal impeller, includes the rim plate, fixes a plurality of blades on the rim plate and covers the wheel cap of establishing in the blade outside, the wheel cap with the air intake that link up is seted up at the rim plate middle part, the blade sets up in the air intake inboard, its characterized in that: and a flow limiting blade is arranged in the outer circumferential direction of each blade, and a flow passage is formed by the flow limiting blade and the adjacent blade far away from the flow limiting blade.

2. The partial flow channel centrifugal impeller of claim 1, wherein: the blades are binary blades or ternary blades.

3. The partial flow channel centrifugal impeller of claim 2, wherein: the binary blades are backward-bent blades, radial blades or forward-bent blades.

4. The partial flow channel centrifugal impeller of any one of claims 1-3, wherein: the shape of the flow-restricting blade matches the profile of the shape of the adjacent blade remote from the flow-restricting blade.

5. The partial flow channel centrifugal impeller of any one of claims 1-3, wherein: the flow-limiting blades are short blades.

6. The partial flow channel centrifugal impeller of any one of claims 1-3, wherein: the flow limiting blades are long blades.

7. The partial flow channel centrifugal impeller of any one of claims 1-3, wherein: the wheel covers are parallel wheel covers with equal width.