Impeller, fan and range hood

Abstract

The utility model belongs to the technical field of draught fans, and particularly relates to an impeller, a draught fan and a range hood, the impeller comprises a wheel disc, a wheel cover and a plurality of blades, the wheel cover is annular, one end of each blade is arranged on the wheel disc, the other end of each blade is connected with the wheel cover, the surface of each blade is arc-shaped, a flow channel is formed between every two adjacent blades, and the flow channels are communicated with the wheel cover. And the section of the flow channel is in a shape which is continuously narrowed from the inlet of the flow channel to the outlet of the flow channel. In addition, the impeller of the scheme is applied to the fan and the range hood. According to the utility model, the width of the section of the runner is continuously reduced from the inlet to the outlet, so that the wind pressure is continuously increased, the airflow speed is continuously increased, a vortex area in the runner can be removed, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen equipment, in particular to an impeller, a fan and a range hood. Background Art

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. It can quickly remove the exhaust gas generated by the combustion of the gas stove and the fumes generated during the cooking process to achieve the purpose of purifying the kitchen environment. The quality of the range hood is often determined by the performance of the centrifugal fan. The impeller is the most important component of the centrifugal fan. The blades are the only part that transfers energy to the fluid. The required flow and pressure are closely related to the blade type. Under a certain speed, the forward impeller of a common fan has a larger pressure coefficient, a smaller impeller diameter, and low noise, but the efficiency is lower. The centrifugal fan used in household range hoods requires a large outlet pressure and a small size, while also taking efficiency into account.

[0003] In summary, the existing impellers used in range hoods need to be further improved. Utility Model Content

[0004] The first invention objective of the utility model is to solve the problem of low efficiency of the existing impeller and to provide an impeller with high air outlet efficiency.

[0005] In order to achieve the above invention objectives, the utility model adopts the following technical solutions:

[0006] An impeller comprises a wheel disc, a wheel cover and blades, wherein the wheel cover is annular, one end of the blade is arranged on the wheel disc, and the other end is connected to the wheel cover, the surface of the blade is arc-shaped, and a flow channel is formed between two adjacent blades, the outlet angle β of the flow channel 7 is between 150° and 180°, the inlet angle a is between 60° and 70°, and the central angle of the impeller 1 is The angle is between 90° and 100°, so that the cross section of the flow channel is in a shape that is continuously narrowed from the inlet to the outlet.

[0007] Compared with the prior art, the data range of the flow channel outlet angle, flow channel inlet angle and impeller center angle in the utility model makes the cross-sectional width of the flow channel continuously decrease from the inlet to the outlet, thereby continuously increasing the wind pressure and air flow velocity, which can clear the vortex area in the flow channel and thus improve efficiency.

[0008] Furthermore, the impeller has a preset width b and an outlet diameter D2, and the impeller width b takes a value between (2 / 5 and 3 / 5) D2 so that the airflow in the flow channel maintains a basically constant speed, and the cross-sectional design of the flow channel allows the airflow to pass through the flow channel at a high speed.

[0009] Further, the inlet diameter D1 of the impeller is between 215 mm and 225 mm, the outlet diameter D2 is between 190 mm and 280 mm, and the distance L1 between the inner edge and the outer edge of the impeller is between 95 mm and 160 mm. In this solution, the range of the inner edge diameter and the outer edge diameter of the impeller is increased, thereby increasing the thickness of the impeller, achieving the effect of increasing the air volume but keeping the wind pressure unchanged.

[0010] Furthermore, the preset width b is 151 mm to 161 mm.

[0011] Furthermore, the impeller has a preset inlet diameter D1, and D1 / D2 is 0.80-0.95.

[0012] Furthermore, two groups of blades are provided, and the two groups of blades are symmetrically arranged at the front and rear ends of the wheel disc, and the wheel cover is provided with two, which are respectively connected to one group of blades, thereby forming two air inlets. This solution is designed with two air inlets, which can inhale air at the same time, significantly improving the ventilation efficiency, so that the fan can achieve higher air volume output under the same working conditions, and meet the application scenarios with large air volume requirements.

[0013] Furthermore, each group of blades has a preset number Z, Z is 59 to 69, so as to meet the requirements of reducing airflow boundary layer separation and reducing relative vortex while avoiding the increase of friction loss in the impeller channel due to too many blades 4, reducing the actual pressure of the fan and increasing energy consumption.

[0014] Another invention object of the utility model is to provide a fan, which is a centrifugal fan and is equipped with the impeller of the above solution. Compared with the prior art, the fan of the utility model has all the advantages of the above solution because it uses the impeller of the above solution.

[0015] The third invention objective of the utility model is to provide a range hood, wherein the range hood is equipped with the fan of the above-mentioned solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The impeller is three-dimensional Figure 1 ;

[0017] Figure 2 is a cross-sectional view of the impeller;

[0018] Figure 3 It is a schematic diagram of the flow path of the impeller;

[0019] Figure 4 It is a side view of the impeller. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described below according to the accompanying drawings:

[0021] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “bottom”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] See also Figures 1 to 4 As shown, the utility model discloses an impeller 1, comprising a wheel disc 2, a wheel cover 3 and blades 4, characterized in that: the wheel cover 3 is annular, one end of the blade 4 is arranged on the wheel disc 2, and the other end is connected to the wheel cover 3, the surface of the blade 4 is arc-shaped, and a flow channel 7 is formed between two adjacent blades 4, and the outlet angle β of the flow channel 7 is between 150° and 180 degrees, which can be 150°, 155°, 160°, 165°, 170°, 175°, 180°, the inlet angle a is between 60° and 70°, and can specifically be 60°, 62°, 64°, 66°, 68°, 70°, and the central angle of the impeller 1 is 1. The angle is between 90° and 100°, which may be 90°, 92°, 94°, 96°, 98°, or 100°, so that the cross section of the flow channel 7 is continuously narrowed from the inlet to the outlet.

[0023] In one embodiment, the impeller 1 has a preset width b and an outlet diameter D2. The width b of the impeller 1 takes a value between (2 / 5 and 3 / 5) D2, which can be 127.50 mm, so that the airflow in the flow channel 7 can basically maintain a constant speed. Combined with the cross-sectional design of the flow channel 7, the airflow can pass through the flow channel 7 at a high speed.

[0024] In one embodiment, the inlet diameter D1 of the impeller 1 is between 215mm and 225mm, which can be 215mm, 217mm, 219mm, 221mm, 223mm, 225mm, and the outlet diameter D2 is between 190mm and 280mm, which can be 190mm, 210mm, 230mm, 250mm, 270mm, 280mm, and the distance L1 between the inner edge and the outer edge of the impeller 1 is between 95mm and 160mm, which can be 95mm, 115mm, 135mm, 145mm, 160mm. In this solution, the range of the inner edge diameter and the outer edge diameter of the impeller 1 increases the thickness of the impeller 1, thereby achieving the effect of increasing the air volume but keeping the wind pressure unchanged.

[0025] In one embodiment, the preset width b is 151 mm to 161 mm, and can be 151 mm, 153 mm, 155 mm, 157 mm, 159 mm, or 161 mm.

[0026] In one embodiment, the impeller 1 has a preset inlet diameter D1, and D1 / D2 is 0.80-0.95, which may be 0.80, 0.83, 0.86, 0.89, 0.92, or 0.95.

[0027] In one embodiment, two groups of blades 4 are provided, and the two groups of blades 4 are symmetrically arranged at the front and rear ends of the wheel disc 2. Two wheel covers 3 are provided, which are respectively connected to one group of blades 4, thereby forming two air inlets. This solution is designed with two air inlets, which can inhale air at the same time, significantly improving the ventilation efficiency, so that the fan can achieve higher air volume output under the same working conditions, and meet the application scenarios with large air volume requirements.

[0028] Furthermore, each group of blades 4 has a preset number Z, Z is 59 to 69, and can be 59, 61, 63, 65, 67, or 69, so as to meet the requirements of reducing the separation of the airflow boundary layer and reducing the relative vortex while avoiding the increase of friction loss in the impeller channel due to too many blades 4, reducing the actual pressure of the fan, and increasing energy consumption.

[0029] In one embodiment, the rotation speed of the impeller 11 is set to be between 1200 rpm and 1400 rpm, which can be 1200 rpm, 1250 rpm, 1300 rpm, 1350 rpm, or 1400 rpm.

[0030] Compared with the prior art, the data range of the outlet angle, inlet angle and central angle of the impeller 1 of the flow channel 7 in the utility model makes the cross-sectional width of the flow channel 7 continuously decrease from the inlet to the outlet, thereby continuously increasing the wind pressure and the air flow velocity, which can clear the vortex area in the flow channel 7 and thus improve the efficiency.

[0031] The utility model also discloses a fan, which is a centrifugal fan and is equipped with the impeller 1 of the above solution. Compared with the prior art, the fan of the utility model has all the advantages of the above solution because the impeller 1 of the above solution is applied. It should be noted that, except for the impeller adopting the above solution, the rest of the structure of the centrifugal fan of the utility model can adopt the conventional centrifugal fan structure solution.

[0032] The utility model also discloses a range hood, which is equipped with the fan of the above solution. It should be noted that, except for the fan adopting the above solution, the rest of the structure of the range hood of the utility model can adopt the conventional range hood structure solution.

[0033] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referenced to each other. According to the disclosure and teachings of the above specification, technicians in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. An impeller (1), comprising a wheel disc (2), a wheel cover (3) and blades (4), characterized in that: The wheel cover (3) is annular, one end of the blade (4) is arranged on the wheel disc (2), and the other end is connected to the wheel cover (3), the surface of the blade (4) is arc-shaped, and a flow channel (7) is formed between two adjacent blades (4), the outlet angle β of the flow channel (7) is between 150° and 180°, the inlet angle a is between 60° and 70°, and the central angle of the impeller (1) is 1. The angle is between 90° and 100°, so that the cross section of the flow channel (7) is in a shape that continuously narrows from the inlet to the outlet.

2. The impeller (1) according to claim 1, characterized in that The impeller (1) has a preset width b and an outlet diameter D2, and the width b of the impeller (1) is a value between (2 / 5 and 3 / 5) of D2.

3. The impeller (1) according to claim 2, characterized in that The inlet diameter D1 of the impeller (1) is between 215 mm and 225 mm, the outlet diameter D2 is between 190 mm and 280 mm, and the distance L1 between the inner edge and the outer edge of the impeller (1) is between 95 mm and 160 mm.

4. The impeller (1) according to claim 3, characterized in that The preset width b is 151 mm to 161 mm.

5. The impeller (1) according to claim 1, characterized in that The impeller (1) has a preset inlet diameter D1, and D1 / D2 is 0.80-0.

95.

6. The impeller (1) according to claim 4, characterized in that The blades (4) are provided in two groups, and the two groups of blades (4) are symmetrically arranged at the front and rear ends of the wheel disc (2). The wheel covers (3) are provided in two groups, each connected to one group of blades (4), thereby forming two air inlets.

7. The impeller (1) according to claim 1, characterized in that Each set of blades (4) has a preset number Z, which is 59 to 69 blades.

8. A fan, characterized in that: The fan is a centrifugal fan and is equipped with an impeller (1) according to any one of claims 1 to 7.

9. A range hood, characterized in that: The range hood is equipped with the fan according to claim 8.

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