Fan impeller and air inlet air leakage prevention device

Abstract

The utility model belongs to the technical field of fans, and particularly relates to a fan impeller and air inlet air leakage prevention device which comprises an air inlet and an impeller, a front disc of the impeller is sleeved on the outer side of the inner end of the air inlet, and a first gap is arranged between the front disc and the air inlet. The center line of the first sealing ring is coaxial with the center line of the impeller rotating shaft, a second gap is formed between the lower end of the first sealing ring and the outer side of the air inlet, and the first gap between the front disc and the air inlet is reduced through the first sealing ring. The fan has the advantages of being reasonable in structure, low in cost and high in fan efficiency. According to the utility model, the sealing ring is simple in structure and convenient to process, the leakage amount between the impeller and the air inlet can be effectively reduced, and the operation efficiency of the fan is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and in particular relates to a fan impeller and an air inlet air leakage prevention device. Background Art

[0002] Fan is a customary abbreviation for gas compression and gas delivery machinery. The fans usually mentioned include ventilators, blowers, and wind turbines. Fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and air induction of boilers and industrial furnaces, cooling and ventilation in air conditioning equipment and household appliances, drying and selection of grains, wind tunnel wind sources and inflation and propulsion of hovercraft, etc.

[0003] In order to ensure a better exhaust effect, the fan of the prior art has a conical arc-shaped air inlet at the exhaust port of the fan's impeller, the air inlet is fixed to the air inlet end of the casing, and the front disc of the impeller is sleeved outside the inner end of the air inlet. In order to ensure the rotation of the impeller, a certain gap needs to be maintained between the front disc of the impeller and the inner end of the air inlet. The above gap will cause a certain degree of attenuation of the fan's air output, resulting in low fan efficiency. In order to solve this problem, technicians in this field generally add a sealing ring at the above-mentioned gap. For example, the utility model patent technology of a centrifugal fan for an air-conditioning system, which was published by the China Patent Office on February 14, 2020, with publication number CN210068547U, includes a casing, an air guide ring fixed to the air inlet of the casing, an impeller installed in the casing, and a sealing ring provided between the air inlet end of the air guide ring and the front disk of the impeller, the impeller includes a front disk docked with the air inlet end of the air guide ring, a flat rear disk and a plurality of blades fixed between the front disk and the rear disk at consistent intervals; the sealing ring is composed of an outer ring, an inner ring and a connecting ring connected between the front end of the outer ring and the rear end of the inner ring; the inner diameter of the outer ring is adapted to the outer diameter of the air inlet end of the air guide ring; the inner diameter of the inner ring is gap-matched with the outer diameter of the front disk of the impeller; the sealing ring is fixed to the outer peripheral surface of the air inlet end of the air guide ring through the outer ring, so that the inner ring of the sealing ring is sleeved outside the front disk of the impeller.

[0004] The fan of the above structure reduces the bypass loss of airflow and improves the efficiency of the fan by adding a Z-shaped sealing ring in the gap between the inner end of the air inlet and the front disk of the fan. However, the Z-shaped sealing ring of the above structure also has the defects of complex structure and high processing cost. Utility Model Content

[0005] The utility model aims to provide a fan impeller and air inlet anti-leakage device, in which a sealing ring perpendicular to the air inlet axis is welded at the front disk of the impeller to reduce the gap between the impeller and the air inlet and improve the fan efficiency.

[0006] The utility model is realized by the following technical solutions:

[0007] That is, a fan impeller and air inlet anti-leakage device, including an air inlet and an impeller, the front disk of the impeller is mounted on the outer side of the inner end of the air inlet, a first gap is provided between the front disk and the air inlet, and it is characterized in that a first sealing ring is welded to the front end of the front disk, the center line of the first sealing ring is coaxial with the center line of the impeller shaft, a second gap is provided between the lower end of the first sealing ring and the outer side of the air inlet, and the second gap is smaller than the first gap.

[0008] The second gap value of the present invention is preferably less than 10 mm.

[0009] The utility model can conveniently reduce the first gap between the front disk and the air inlet by welding the first sealing ring at the front end of the impeller front disk. Compared with the Z-shaped sealing ring of CN210068547U, the first sealing ring has a simple structure and is easy to process. It can be manufactured by cutting steel plates with a general CNC laser or plasma cutting machine and then splicing them.

[0010] Furthermore, the utility model has a second sealing ring welded to the outside of the air inlet near the first sealing ring, the center line of the second sealing ring is coaxial with the center line of the impeller shaft, the first sealing ring and the second sealing ring are arranged in parallel, and a third gap is provided between the second sealing ring and the first sealing ring.

[0011] The third gap value of the present invention is preferably less than 10 mm.

[0012] The first sealing ring and the second sealing ring of the utility model are arranged in parallel, and the third gap between the two is very small. When the leaked airflow passes through the third gap between the two sealing rings, the two sealing rings can play a flow blocking role, reduce the leakage here, and improve the operating efficiency of the fan.

[0013] Furthermore, the outer diameter of the second sealing ring of the utility model is greater than the inner diameter of the front disc, and is greater than or equal to the outer diameter of the first sealing ring, which can increase the flow channel area and better play a role in flow resistance.

[0014] The utility model has the advantages of reasonable structure, low cost and high fan efficiency. When using the utility model, the sealing ring has a simple structure and is easy to process, and can effectively reduce the leakage between the impeller and the air inlet, thereby improving the operating efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0016] Figure 2 This is a schematic diagram of the structure of Example 2 of the utility model.

[0017] As shown in the figure: 1. Air inlet; 2. Second gap; 3. First sealing ring; 4. Front disc; 5. First gap; 6. Impeller; 7. Second sealing ring; 8. Third gap. DETAILED DESCRIPTION

[0018] The following is a detailed description of the embodiments of the technical solution of the utility model in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the scope of protection of the utility model. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by technicians in the field to which the utility model belongs. Example 1

[0019] like Figure 1 As shown: the front end of the front disk 4 of the impeller 6 is mounted on the outer side of the inner end of the air inlet 1, a first gap 5 is provided between the front disk 4 and the air inlet 1, a first sealing ring 3 is welded to the front end of the front disk 4, the center line of the first sealing ring 3 is coaxial with the center line of the impeller 6 rotating shaft, a second gap 2 is provided between the lower end of the first sealing ring 3 and the outer side of the air inlet 1, and the second gap 2 is smaller than the first gap 5.

[0020] The utility model is used in the same way as the prior art fan, which will not be described in detail here. Since the second gap 2 is smaller than the first gap 5, the leakage between the impeller 6 and the air inlet 1 is effectively reduced, thereby improving the operating efficiency of the fan. Example 2

[0021] like Figure 2 As shown: a second sealing ring 7 welded to the outside of the air inlet 1 is provided on the left side of the first sealing ring 3, the center line of the second sealing ring 7 is coaxial with the center line of the impeller 6 shaft, the first sealing ring 3 and the second sealing ring 7 are arranged in parallel, and a third gap 8 is provided between the two. Other parts are the same as those in Example 1.

[0022] The third gap 8 of this embodiment is very small. Compared with embodiment 1, when the leaked airflow passes through the third gap 8 between the two sealing rings, the two sealing rings can play a flow-blocking role. Compared with embodiment 1, the leakage between the impeller 6 and the air inlet 1 is smaller, and the fan operating efficiency is higher.

[0023] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A fan impeller and air inlet leakage prevention device, comprising an air inlet and an impeller, wherein a front disc of the impeller is mounted on the outer side of the inner end of the air inlet, and a first gap is provided between the front disc and the air inlet, characterized in that A first sealing ring is welded to the front end of the front disk, the center line of the first sealing ring is coaxial with the center line of the impeller shaft, a second gap is provided between the lower end of the first sealing ring and the outer side of the air inlet, and the first sealing ring reduces the first gap between the front disk and the air inlet.

2. A fan impeller and air inlet leakage prevention device according to claim 1, characterized in that A second sealing ring welded to the outside of the air inlet is provided near the first sealing ring, the center line of the second sealing ring is coaxial with the center line of the impeller shaft, the first sealing ring and the second sealing ring are arranged in parallel, and a third gap is provided between the second sealing ring and the first sealing ring.

3. A fan impeller and air inlet leakage prevention device according to claim 1, characterized in that The outer diameter of the second sealing ring is greater than the inner diameter of the front disc and greater than or equal to the outer diameter of the first sealing ring.

Images