An inner-embedded motor fan for a range hood

Abstract

The utility model discloses an inner -embedding type motor fan for oil fume exhauster belongs to oil fume exhauster ventilation equipment technical field. In view of the concentricity of the existing oil fume exhauster fan difficult to control, the insufficient air intake, the loud noise, the long installation size and other problems caused by the long motor shaft, the fan includes scroll case, motor, fan blade and air intake, the scroll case is internally provided with motor mounting cavity, the motor is wholly embedded in the cavity and no part is exposed, the motor output shaft is short shaft structure, the fan blade is fixed on the output shaft and is wholly located in the scroll case, and the effective ventilation area of the air intake is increased by 20%-40% compared with the traditional fan. The utility model can improve the rotation concentricity and stability of the fan blade, increase the air intake, reduce the motor speed and noise under the same air volume, shorten the fan installation size at the same time, and adapt to the use demand of compact oil fume exhauster.

Description

Technical Field

[0001] This utility model relates to the technical field of range hood ventilation equipment, specifically to an embedded motor fan for range hoods. Background Technology

[0002] As the core smoke extraction equipment in the kitchen, the performance of the range hood's fan directly determines the smoke extraction effect and user experience. Currently, most range hood fans adopt a structural design where the motor is exposed outside the volute housing; that is, the motor partially or completely extends out of the volute housing, and the motor output shaft passes through the volute housing before connecting to the fan blades.

[0003] This traditional structure has the following inherent drawbacks: 1. Difficulty in controlling concentricity: In order to achieve the fit between the fan blade and the volute, the motor output shaft needs to be designed to be relatively long (usually 1.5-2 times the thickness of the volute). The long shaft is prone to deformation due to deflection during operation, which leads to the concentricity deviation of the fan blade. During assembly, the motor's own runout and the weight of the fan blade are superimposed, further aggravating the concentricity problem. 2. Low air intake efficiency: The exposed motor part will block the air intake path of the volute, forming a dead air intake angle, resulting in insufficient air intake and affecting the smoke exhaust speed. 3. High noise pollution: In order to make up for the air volume gap caused by insufficient air intake, the speed of motor and fan blades needs to be increased. Under high speed operation, the noise of air disturbance, fan blade jumping and motor operation are superimposed, resulting in a high overall noise level. 4. Excessive installation length: The exposed motor requires additional installation space, which significantly increases the overall length of the fan, limiting the compact design of the range hood, and making it particularly unsuitable for narrow-body range hoods in small kitchens. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned problems by proposing an embedded motor fan for range hoods.

[0005] An embedded motor fan for a range hood includes a volute 2, a motor 1, fan blades, a motor bracket, and an air inlet 3. The connection and structural design of each component are as follows: Scroll housing structure: Scroll housing 2 is made of sheet metal or high-temperature resistant plastic material, with a reserved motor mounting cavity inside. The inner wall of the mounting cavity is integrally formed or welded with 3-4 symmetrically distributed motor brackets, and bolt holes are opened on the brackets. Motor installation: The motor 1 is embedded inside the motor mounting cavity of the volute 2. The motor 1 is fixed to the motor bracket with bolts, ensuring that the motor axis coincides with the central axis of the volute 2 (coaxiality error ≤ 0.1mm). No part of the motor 1 is exposed outside the volute 2. Short shaft design: A short shaft motor is selected, with its output shaft length shortened by 30%-50% compared to traditional motors. A keyway or external thread is provided at the end of the output shaft for fixing the fan blades. Fan blade assembly: The fan blade adopts a 3-6 arc-shaped blade structure. The curvature of the blade is adapted to the air inlet direction of the volute. The center of the fan blade is opened with a shaft hole adapted to the motor output shaft. It is fastened to the output shaft by key connection or nut. The entire fan blade is located inside the volute and faces the air inlet. Air inlet optimization: Air inlet 3 is located at one or both ends of the volute. The effective ventilation area of ​​air inlet 3 is 20%-40% larger than that of traditional fans. A protective net can be detachably installed on the inner side of air inlet 3 to prevent foreign objects from entering the volute.

[0006] The beneficial effects of this utility model are: This application reduces the deflection of the shortened motor shaft, and with the coaxial fixation of the motor bracket, the concentricity error of the fan blades can be controlled within 0.1mm during operation. The fan blade runout is reduced by 60%-80%, and the vibration amplitude is reduced to less than 1 / 3 of that of traditional fans, resulting in smoother fan operation and extended service life. The motor is completely embedded in the volute, eliminating the obstruction of the air intake path by the exposed motor. Combined with the increased air intake area, the air intake volume is increased by 25%-35%, and the smoke exhaust speed is accelerated, allowing for rapid removal of kitchen fumes. Under the same air volume requirements, due to the sufficient air intake, the speed of the motor and fan blades can be reduced by 15%-25%, and the overall noise level can be controlled at 55-60dB, which is 10-15dB lower than that of traditional fans, improving the kitchen sound environment. With the motor embedded in the volute, the overall length of the fan is only the length of the volute itself, which is 40%-60% shorter than that of traditional fans, making it suitable for the installation requirements of narrow-body range hoods and improving the utilization of kitchen space. Attached Figure Description

[0007] Figure 1 This is an overall structural diagram of the fan shown in this utility model; Figure 2 This is a schematic diagram of the motor shown in this utility model.

[0008] Reference numerals: 1. Motor; 2. Vortex casing; 3. Air inlet. Detailed Implementation

[0009] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0010] Component selection: Vortex housing 2: It is made of 0.8mm thick cold-rolled steel plate by stamping. The inner diameter of the vortex housing is 280mm, the length is 200mm, the diameter of the internal motor mounting cavity is 100mm and the depth is 80mm, and 4 stainless steel motor brackets are welded to the inner wall of the cavity. Motor 1: A 120W DC brushless motor is selected, with an outer diameter of 98mm, a length of 75mm, an output shaft diameter of 8mm, a length of 40mm, and a keyway at the shaft end; Fan blades: Made of ABS plastic, with 4 curved blades, blade curvature of 15°, fan blade diameter of 260mm, and central shaft hole of 8mm; Air inlet 3: Located at one end of the volute, with a diameter of 200mm, and a metal protective mesh with a diameter of 195mm installed on the inside.

[0011] Assembly steps: Step 1: Fix motor 1 to the motor bracket of volute 2 with M4 bolts, ensuring that the motor axis coincides with the volute axis. Use a dial indicator to check the coaxiality, and control the error within 0.08mm. Step 2: Connect the fan blade to the motor output shaft using a key, with a 15mm gap between the fan blade end face and the motor end face, and then tighten the fan blade with an M8 nut. Step 3: Install the protective net inside the air inlet 3 using the clips, and check if the fan blades rotate smoothly; Step 4: Connect the assembled fan to the range hood duct and test its operation.

[0012] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An embedded motor fan for a range hood, characterized in that, It includes a volute, a motor, a fan blade, and an air inlet; the volute has a motor mounting cavity inside that is adapted to the shape of the motor, the motor is entirely embedded in the motor mounting cavity and no part is exposed outside the volute, the output shaft of the motor is a short shaft structure, the fan blade is fixedly installed on the output shaft of the motor and is entirely located inside the volute; the air inlet is located at at least one end of the volute.

2. The embedded motor fan for a range hood according to claim 1, characterized in that, A motor bracket is fixedly installed on the inner wall of the motor mounting cavity. The motor is detachably connected to the motor bracket by bolts, and the axis of the motor coincides with the central axis of the volute, with a coaxiality error of ≤0.1mm.

3. The embedded motor fan for a range hood according to claim 2, characterized in that, The number of motor brackets is 3-4, and they are evenly and symmetrically distributed along the inner wall of the motor mounting cavity.

4. The embedded motor fan for a range hood according to claim 1, characterized in that, A protective net is detachably installed on the inner side of the air inlet, and the shape of the protective net is adapted to the air inlet.

5. The embedded motor fan for a range hood according to claim 1, characterized in that, A shock-absorbing pad, made of silicone material, is also provided between the motor and the inner wall of the motor mounting cavity of the volute.

6. The embedded motor fan for a range hood according to claim 1, characterized in that, The fan blade includes 3-6 arc-shaped blades, the curvature of which is adapted to the air intake direction of the vortex casing. The center of the fan blade has a shaft hole adapted to the motor output shaft. The fan blade is fixed to the motor output shaft by key connection or nut fastening.

7. The embedded motor fan for a range hood according to claim 1, characterized in that, The vortex housing is made of sheet metal or high-temperature resistant plastic material, and the thickness of the sheet metal material is 0.6-1.0mm.

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